Embryonic stem cells (ESC) from a five-day-old blastocyst can be harvested.
These embryonic stem cells are between three and five days old. An embryo at this stage is known as a blastocyst and contains 150 cells or less. They are pluripotent stem cells, which can differentiate into any form of body cell or additional stem cells (ploo-RIP-uh-tunt).
The inner cell mass of the human blastocyst, an early stage of the growing embryo lasting from the fourth to the seventh day after fertilization, contains embryonic stem cells (ESCs). After the seventh day, they vanish in a typical embryo's growth and the three layers of embryonic tissue start to form.
Embryos produce embryonic stem cells.
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choose the best description of the cell cytoskeleton.
A)The cell cytoskeleton serves as permanent scaffolding to anchor cell components into position within the cell cytoplasm.
B)The cell cytoskeleton is similar to an animal skeleton in providing rigid internal support and structure to the cell.
C)The cell cytoskeleton is a dynamic network of fibers that can be quickly dismantled and reassembled to change cell shape and the position of cell components
The cell cytoskeleton is a dynamic network of fibers that can be quickly dismantled and reassembled to change cell shape and the position of cell components. Hence option C is correct.
What is cytoskeleton?Cytoskeleton is defined as all cells, even those of bacteria and archaea, have a complex, dynamic network of interconnecting protein filaments. A sophisticated web of protein filaments and motor proteins is present in these fibers in eukaryotic cells, which aid in cell movement.
The cytoskeleton is a framework that aids in maintaining the internal order and shape of cells. Additionally, it provides mechanical support, enabling cells to carry out essential functions including division and motility. There isn't just one cytoskeletal element.
Thus, the cell cytoskeleton is a dynamic network of fibers that can be quickly dismantled and reassembled to change cell shape and the position of cell components. Hence option C is correct.
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which of the following statements help to explain the pathogenesis of human transmissible spongiform encephalopathy?
By altering its structure, aberrant PrpSc protein changes the normal host PrpC protein into infectious PrpSc protein.
What does the pathophysiology of a disease entail?
Pathogenesis is the process by which an infection leads to illness. Some of the pathogenic mechanisms of viral disease include virus implantation at the place of entry, local replication, diffusion to target organs (disease sites), propagation to sites of virus shedding into the environment, and so on.
That pathology is what kind?
Different types of pathogenesis, such as microbial infection, inflammation, malignancy, and tissue deterioration, are possible. Bacterial pathogenesis, for instance, is the process by which bacteria cause infectious disease. Numerous variables contribute to the majority of diseases.
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Which of the following illustrates the fact that culture is learned rather than biologically inherited?
a Humans living in desert environments require about two gallons of liquid a day to maintain constant body temperature.
b Nonhuman animals eat and drink when they have the urge.
c Humans have a biological drive to eat and drink.
d Human societies differ in whether their members eat five meals a day or only one, and what types of food and drink are considered appropriate or taboo.
e In a harsh environment, there is great competition for available food resources.
The correct option is D) Human societies differ in whether their members eat five meals a day or only one, and what types of food and drink are considered appropriate or taboo.
The idea that certain actions are caused by social influences rather than by inheritance or instincts, which are biologically established patterns of conduct. It's vital to keep in mind that culture is not passed down genetically; rather, it is taught via language and imitation of others. Language's syntax, lexicon, and semantics all carry cultural information. Therefore, it is critical to reiterate the distinction between the study of socialization, which examines the set of species-wide requirements and demands placed on people by human societies, and the study of enculturation, which examines the process of learning a culture in all its distinctiveness and particularity.
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What are parallel pathways?
There are three pathways within V1 that perform different functions in parallel.
Magnocellular pathway: begins with m type ganglion cells of the retina. These cells send axons to the magnocellular layers of the LGN. These layers project to layer IVCa of striate cortex, which in turn projects to layer IVB. Because of cortical neurons are direction selective this pathway may be involved in the analysis of object motion and the guidance of motor actions
The parvo-interblob pathway: originates with p-type ganglion cells f the retina, which project to the parvocellular layers of the LGN.The parvocellular LGN sends axons to layer IVCa of striate cortex which projects to layer II and III inter blob regions. Neurons in this pathway have small orientations-selective receptive fields, so perhaps they are involved in the analysis of fine object shape.
The Blob pathway: receives input from the subset of ganglion cells that are neither m or p type cells. These non m/p cells project to the koniocellular layers of the LGN. The koniocellular LGN projects directly to the cytochrome oxidase blobs in layers II and III. Many neurons in the blobs are color selective so they might be involved in analysis of color.
Answer:
The term "parallel pathways" refers to the fact that there are multiple neural pathways in the brain that perform different functions, and that these pathways operate in parallel with each other. In the context of vision, the three main parallel pathways are the magnocellular pathway, the parvocellular pathway, and the Blob pathway. Each of these pathways originates in different cells in the retina and performs different functions in the visual system. For example, the magnocellular pathway is involved in motion detection and the guidance of motor actions, while the parvocellular pathway is involved in the analysis of fine object shapes. The Blob pathway is involved in color analysis. Together, these three pathways work in parallel to enable the brain to process visual information.
in meiosis, crossing over occurs, where homologous chromosomes synapse and their chromatids exchange genetic information. during crossing over, the allele for one trait swaps places with the allele for the same trait on the homologous chromosome. at this point, the sister chromatids are no longer identical. when the chromatids split from each other, there are four unique haploid sperm or egg cells.
This is not a answer but for anyone that wants to help here are the images
In pea plants, tall plants are dominant over short plants. If a heterozygous plant was crossed with a homozygous recessive plant, what percent of the offspring would be short?
The ascending limb of loop of Henle is permeable to
A. Glucose
B. NH3
C. Na+
D. Water
The ascending limb of the loop of Henle is permeable to C. Na+.
One of the structures in the nephron of the kidney is the ascending limb of the loop of Henle, which is a direct continuation of the descending limb of the loop of Henle. There is a thin and thick segment on the ascending limb.
Distal convoluted tubule and Henle's loop, The ascending loop of Henle is permeable to the Na+ ion but impermeable to water, whereas the descending loop of Henle is permeable to water and impermeable to Na+. As a result, the electrolytes that travel to the medullary fluid cause the concentrated filtrate to become diluted as it ascends. The job of the loop of Henle is to make an expanded salt fixation slope in the medulla. The loop of Henle is a counter-current multiplier; The concentration gradient in the medulla is greater the longer the loop.
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Is this the correct answer? If not then what is it please tell me
Tonight the music seems so loud
I wish that we could lose this crowd
Maybe it's better this way
We'd hurt each other with the things we'd want to say
We could have been so good together
We could have lived this dance forever
But now, who's gonna dance with me?
Answer:
A phosphate is lost and energy is released.
Explanation:
The explanation is in the photo, it shows the cycle from ATP to ADP to ATP and so on.
which substances is a reactant of aerobic cellular respiration
A. Glucose
B. Carbon Dioxide
C. Nitrogen
D. Water
Answer:
A. Glucose is a reactant of aerobic cellular respiration
in meiosis, crossing over occurs, where homologous chromosomes synapse and their chromatids exchange genetic information. during crossing over, the allele for one trait swaps places with the allele for the same trait on the homologous chromosome. at this point, the sister chromatids are no longer identical. when the chromatids split from each other, there are four unique haploid sperm or egg cells.
Chiasmata in meiosis, crossing over occurs, where homologous chromosomes synapse and their chromatids exchange genetic information. during crossing over, the allele for one trait swaps places with the allele for the same trait on the homologous chromosome.
During meiosis, the chiasma, which is a structure formed by crossover recombination between a pair of homologous chromosomes, physically connects the two chromosomes. The two homologous chromosomes do not entirely split; rather, they are still joined at one or more locations, as seen by X configurations called Chiasmata. Chiasmata displacement is referred to as terminalization, and it is finished during the diakinesis stage. Prophase 1's Diplotene phase is when chiasmata are created. Crossover occurs during the first prophase of meiosis. The chiasmata designates the location of the crossing over.
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which of the following events in transcription initiation likely occurs last? view available hint(s)for part e which of the following events in transcription initiation likely occurs last? tbp is recruited to the promoter. regulatory transcription factors bind to enhancers. basal transcription factors form a basal transcription complex. rna polymerase binds to the promoter of the gene.
RNA polymerase binds to the promoter of the gene is the correct event in transcription initiation likely occurs last.
The first nucleotides in the RNA chain are created during the transcription beginning phase. The RNAP holoenzyme binds to the DNA template to begin the multi-step process, which is completed when the core polymerase exits from the promoter after approximately the first nine nucleotides have been synthesized.
The sorts of interactions between the RNAP and the nucleic acids that are involved can be used to explain the steps of the transcription initiation process. The creation of a complex between the holoenzyme and the DNA sequence at the promoter, which takes the form of a double-stranded DNA, is the initial step in transcription initiation. Closed binary complex or closed describes this complex.
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What is the main role of RNA polymerase during transcription?
A. To form mRNA using a DNA template strand
B. To pull apart the double helix
C. To separate from the DNA template strand
D. To attach to the promotor of a gene
Explanation:
RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, during the process of transcription.
Which of the following best describes the time period in which the novel is set? A. The depression era B. The golden age C. Civil rights era D. The roaring twenties
The right answer is C. The era in which the book is situated is best characterized as the civil rights era.
What is meant by depression?Depression is a prevalent mental illness. According to estimates, the condition affects 5% of adults worldwide. Consistent sorrow and then a lack of enthusiasm in formerly fulfilling or joyful activities are its defining traits. Additionally, it may impair appetite and sleep. Concentration problems and fatigue are frequent.
What transpires throughout a depression?For the majority of two weeks, mood and/or attention (pleasure) are diminished in serious depression. Self-esteem is typically preserved during mourning. Feelings of futility and self-hatred are frequent in serious depression.
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in humans, dnmt1 acts as a , an enzyme that can add methyl groups to bases in newly replicated dna molecules.
In humans, DNMT1 acts as a maintenance methylase, an enzyme that can add methyl groups to bases in newly replicated DNA molecules.
What is an Enzyme?This is referred to as a biological catalyst which are involved in speeding up the rate of reactions in the body by lowering the activation energy. They are proteinous and can be denatured by heat or other types of chemical substances.
DNA methyltransferase 1(DNMT1) is the enzyme which is involved in the addition of methyl groups to bases in newly replicated DNA molecules and therefore functions as a maintenance methylase. This is important as it helps in the regulation of tissue-specific gene expression, X chromosome inactivation etc in the body of an organism thereby making it the correct choice.
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Phosphagens are a group of molecules that includes creatine phosphate (in vertebrates), and arginine phosphate, lombricine, and phosphoopheline (in invertebrates). These molecules have similar functions in different organisms.
What functions do these molecules have in common?
HW-13
-They can accept phosphoryl groups from ATP when ATP is present in excess.
-They increase the strength and size of muscle tissue.
-They can take the place of ATP in metabolic reactions when [ATP] is low in the body.
-They can be chemically converted to ATP, which is hydrolyzed to ADP to provide energy.
-They can donate phosphoryl groups to ADP to regenerate ATP.
When glycolysis or oxidative phosphorylation cannot quickly supply the energy required by muscular tissues, phosphoglycation steps in to fill the gap.
Option b is correct
How does the phosphagen system function and what is it?The term "phosphagen energy system" refers to the total amount of cellular ATP and phosphocreatine. For 8 to 10 seconds, or about enough time for a 100-meter run, these chemicals can work together to provide maximum muscle strength. As a result, the phosphagen system's energy is employed to produce the strongest possible short bursts of muscle force.
What exactly does phosphagen mean?Any of a number of organic phosphate molecules, including phosphocreatine and phosphoarginine, that are found mostly in muscles and release energy upon phosphate breakdown.
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Atmospheric
pressure is also known as barometric pressure because it
is measured using a barometer. A rising barometer indicates increasing
atmospheric pressure and a falling barometer indicates decreasing
atmospheric pressure.
HOW DOES THIS FACT FROM MY SUB QUESTION ANSWER THAT COMES FROM A ARTICLE RELATE TO MY RESEARCH QUESTION WHICH IS
What effect does the amount of air pressure have on how far a soccer ball travels when kicked?
Answer:
The greater the air pressure in the ball, the farther it will travel when a force is applied.
suppose you are a conservation biologist who manages a large landscape. your landscape has several patches of native vegetation. there are 10 possible locations where you could build corridors, but you have only been given the resources to build 5 corridors. your goal is to maximize plant species richness in your patches, so you must decide where to build your 5 corridors. drag corridors to the 5 locations that would maximize connectivity between the patches. you can use any combination of north-south and east-west corridors. drag an x to each of the 5 locations where you do not want a corridor. labels can be used more than once.
Drag an X to each of the 5 locations where you do not want a corridor.
x
- - x
x x | x |
-
Conservation biology is the study of nature and biodiversity conservation with the goal of protecting species, habitats, and ecosystems from extinction and the erosion of biotic interactions. It is an interdisciplinary subject drawing on natural and social sciences, and the practice of natural resource management.
Conservation biology and the concept of biological diversity (biodiversity) co-emerged, contributing to the modern era of conservation science and policy. Conservation biology's inherent multidisciplinary basis has given rise to new subdisciplines such as conservation social science, conservation behavior, and conservation physiology. It stimulated further development of conservation genetics which Otto Frankel had originated first but is now often considered a subdiscipline as well.
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which of the following is false regarding chorionic villus sampling (cvs)? it is a genetic test that is done when a fetal genetic defect is suspected. it can be done earlier than an amniocentesis can be done. it samples the chorionic villi of the placenta. it takes cells from the cervix to detect dysplasia and cancer.
The false statement is "It takes cells from the cervix to detect dysplasia and cancer".
Chorionic villus sampling, also known as "chorionic villous sampling," is a type of prenatal diagnosis used to identify chromosomal or genetic abnormalities in the fetus. The chorionic villus is sampled and tested for chromosomal abnormalities, usually with FISH or PCR.
CVS is a test that may be offered to you during pregnancy to determine if your baby has a genetic or chromosomal condition such as Down syndrome, Edwards syndrome, or Patau's syndrome. CVS uses a catheter or a needle to biopsy placental cells derived from the same fertilized egg as the fetus.
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TDQ3: Without looking at page 3 (as much as you can), draw the process of mitosis. You will need to be able to draw and explain each step of mitosis on assessments.
The cell cycle phase known as mitosis occurs when a cell's nucleus divides into two daughter nuclei, each of which contains an equal amount of genetic material. After the nucleus separates, it follows the G2 phase and is followed by cytoplasmic division.
The proliferation of cells and the replacement of damaged cells depend on mitosis. Genetic diseases could be caused by aberrations during mitosis.
Interphase
A cell spends a portion of its growth cycle in interphase before initiating mitosis. When in interphase, it goes through the following phases:
G1 Phase: The G1 Phase is the time frame prior to DNA synthesis.
S Phase: The phase during which DNA synthesis occurs is known as the S phase.
G2 Phase: Between the conclusion of DNA synthesis and the start of the prophase is the G2 phase.
Prophase
The cycle's prophase, which comes just after the S and G2 phases, is characterised by the condensing of the genetic material into compact mitotic chromosomes made of two chromatids joined at the centromere.
The start of the construction of the mitotic spindle, the microtubules, and the proteinaceous cytoplasmic elements that aid in the process mark the end of the prophase.
Metaphase
At this point, the chromosomes begin to be pulled by the microtubules equally, and they end up at the centre of the cell. The metaphase plate refers to this area. As a result, every cell receives a fully functional genome.
Anaphase
Anaphase begins with the separation of the sister chromatids. These sister chromatids develop into the daughter nuclei's chromosomes. The fibres connected to each chromosome's kinetochores then tug the chromosomes in that direction. Each chromosome's centromere leads at the edge while the arms follow.
Telophase
As the nuclear membrane begins to form surrounding it, the chromosomes that are clustered at the two poles start to coalesce into an undifferentiated mass. After disappearing after prophase, the nucleolus, Golgi bodies, and ER complex begin to return.
Hence, cell cycle is organized and sequential event.
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Evolutionary theories of motivation suggest that motives result in behaviors that a. maximize reproductive success. b. reduce biological needs. c. restore homeostasis. d. reduce incentives.
a. maximize reproductive success.
Evolutionary theories of motivation suggest that motives result in behaviors that maximize reproductive success.
What are evolutionary theories?Evolutionary theories take the long-term look at the emergence of the human species. According to this perspective, humans of today carry with them genetically guided characteristics passed from generation to generation that have contributed to survival and reproductive success.
Evolutionary theory highlights the adaptive value of within-species variability. Optimal biological and behavioral strategies differ depending on the nature of the environmental context.
When the same adaptations evolve independently, under similar selection pressures. For example, flying insects, birds and bats have all evolved the ability to fly, but independently of each other.
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Please help !
Which of the following apply to cryoprecipitate:
A. a concentrated sample of white blood cells
B.none of the above apply to cryoprecipitate
C. a concentrated sample of B-specific carbohvdrate
D. a concentrated sample of D-specific alloantibody
E. a concentrated sample of coagulation proteins
E. a concentrated sample of coagulation proteins is correct.
E. a concentrated sample of coagulation proteins is correct.
Cryoprecipitate is a blood product that is obtained by freezing and thawing plasma. It is a concentrated sample of coagulation proteins, including factors VIII and XIII, von Willebrand factor, and fibrinogen. Cryoprecipitate is used to treat bleeding disorders, such as hemophilia, and to support blood clotting in other medical conditions.
A. a concentrated sample of white blood cells is not correct. White blood cells are a type of immune cell that helps to fight infections and other diseases. They are not present in cryoprecipitate.
B.none of the above apply to cryoprecipitate is not correct. Cryoprecipitate is a concentrated sample of coagulation proteins, as described above.
C. a concentrated sample of B-specific carbohydrate is not correct. Carbohydrates are a type of biomolecule that provides energy to the body. They are not present in cryoprecipitate.
D. a concentrated sample of D-specific alloantibody is not correct. Alloantibodies are antibodies that are produced in response to foreign substances, such as transplanted organs or blood transfusions. They are not present in cryoprecipitate.
what is science?in terms of biology
Answer:
Biology is a branch of science that deals with living organisms and their vital processes
Explanation:
Biology is a natural science discipline that studies living things.
It is a very large and broad field due to the wide variety of life found on Earth, so individual biologists normally focus on specific fields.
These fields are either categorized by the scale of life or by the types of organisms studied.
in what frequencies would you expect the offspring genotypes? indicate the frequency of each genotype by dragging the labels to the table. labels may be used once, more than once, or not at all. resethelp
According to Hardy-Weinberg, gene frequencies do not alter without being subjected to external pressure. This is a good estimate that ignores random drift while facilitating some calculations.
What does "frequencies" actually mean?
the regularity or repetition of anything, or the fact that something happens frequently or a lot of times: Concerns about bus frequency rose from the previous year. the increase in violence attacks..
How often happens in actual life?
The frequency of the wave is the total number of waves generated in one second. Frequency refers to the number of vibrations measured each second. Here is an easy illustration: Suppose one second produces five full waves.
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in the experiments this semester, you saw many different colors. please select the color that most closely matches what you observed in these experiments. the color of dna as isolated from strawberries: colorless the color of the bromocresol green solution you used *before the addition of any albumin*: the color of the complex of dna with propidium iodide:
A fluorescent DNA dye that is not membrane permeable is propidium iodide. For use in flow cytometry, in situ hybridization, and immunohistochemistry, it is utilized to stain apoptotic cells Belloc et al (1994). Additionally, it can be utilized to distinguish between necrotic and apoptotic cell death.
Propidium iodide stains DNA in what ways?A cell-impermeant DNA binding dye that can be used to stain cells and nucleic acids is called propidium iodide (PI). One dye binds to every 4-5 base pairs of DNA when PI intercalates between the bases to bind to DNA. Sequence preference is either negligible or absent.
How do cells get stained with propidium iodide?A membrane-impermeant dye called propidium iodide (PI) is often rejected from live cells. It intercalates between bases in double-stranded DNA to attach to it. PI is stimulated at 488 nm and emits at a maximal wavelength of 617 nm after a somewhat high Stokes shift.
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dooley co. had 200,000 shares of common stock, 20,000 shares of convertible preferred stock, and $1,000,000 of 10% convertible bonds outstanding during 20a1. the preferred stock is convertible into 40,000 shares of common stock. during 20a1, dooley paid dividends of $ 1.20 per share on the common stock and $ 3.00 per share on the preferred stock. each $ 1,000 bond is convertible into 45 shares of common stock. the net income for 20a1 was $ 600,000 and the income tax rate was 30%. basic earnings per share for 20a1 is (rounded to nearest cent)
40,000 units of common shares can be obtained in exchange for the preferred stock. Dooley distributed dividends on the common shares in 20A1 in the amount of $1.20 per share.
How do you define stock?These ownership certificates for any organization are generally referred to as "stocks." In contrast, a share refers to the shares of a certain company. Those who had shares in a specific company are referred to as shareholders. There are two types of stocks: preferred and common.
Why do investors purchase stocks?Your investment portfolio may benefit from including stocks. Investing in stocks of various companies can help you increase your savings, shield your cash from hyperinflation and taxes, and increase the return on your assets. It's imperative to be knowledgeable about the risks involved with stock market investment.
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which of these statements correctly describes an agglutination reaction? group of answer choices gluten peptides presented by apcs are sticky, so the cells clump together a cell suspension incubated with fluorophore-conjugated antibodies can be run on a flow cytometer antibodies bound to antigen-expressing cells form large macroscopic aggregates it cannot be used to determine a patient's blood type
Gluten peptides presented by APCs are sticky. This is correct for an agglutination reaction.
Aglutination occurs when an insoluble or particle antigen interacts with an antibody. A positive reaction can be detected macroscopically in a short period of time. The antigen-antibody complex, on the other hand, can be seen with the bare eye if it is large enough. The agglutination reaction could involve both IgG and IgM. Agglutination occurs when an antigen and its corresponding antibody, known as isoagglutinin, combine. This expression is commonly used in blood grouping.
Hemagglutination is the process by which red blood cells clump or clog. The agglutin involved in hemagglutination is hemagglutinin. In cross-matching, donor red blood cells are incubated with the recipient's serum or plasma. Agglutination occurs when the blood types of the donor and recipient are incompatible.
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please help me with this question asap!
This is a photosynthesis concept map. The terms re placed below according to concept map:
1) Oxygen (O₂)
2) Sunlight
3) NADPH
4) Glucose (C₆H₁₂O₆)
5) Carbon dioxide
6) Oxygen
7) Light independent
8) Light dependent
9) Water
10) Electrons
11) ATP +CO₂
12) Sugars (C₁₂H₂₂O₁₁)
What is photosynthesis?Photosynthesis is the conversion of light energy into chemical energy in green plants and certain other organisms. The process of turning water, carbon dioxide, and minerals into oxygen- and energy-rich organic molecules is known as photosynthesis, and it takes place in green plants.
Photosynthesis' primary job is to transform solar energy into chemical energy, which is then stored for future use. The majority of the planet's biological systems are propelled by this process.
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if the frequency of the m allele in the human mn blood group system is 0.65 in a population at equilibrium, then the frequency of the n allele must be 0.04. t/f
If the frequency of the m allele in the human mn blood group system is 0.65 in a population at equilibrium, then the frequency of the n allele must be 0.04 is false.
The frequency of the N allele must be 0.35 since the sum of the allele frequencies must equal 1. The genotype frequency of a population can be calculated by dividing the total population size by the number of people who share a particular genotype. The genotype frequency is a frequency or percentage measure used in population genetics.
Squaring the allele frequency A yields the genotype AA frequency. By squaring a, one may determine the frequency of aa. Try changing p and q to various numbers, but make sure they remain equal to 1. The genotype frequency is the proportion of the population that belongs to a particular genotype. If it is found that six out of the 200 people studied for a site with three different alleles have the genotype AA, the genotype frequency for that place is 6/200, or 0.03 per cent.
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Living organisms make and use three main types of ribonucleic acids (RNA) for their biological functions: * ribosomal RNA (rRNA) * messenger RNA (mRNA) * transfer RNA (tRNA)Match each description to the type of RNA it describes.
A. mRNA
B. rRNA
C. tRNA
1.contains and anticodon
2.has amino acids covalently attached
3.is assembled in the nucleolus
4.is the most abundant form of RNA
5.is a component of ribosomes
6.specifies the amino acid sequence for a protein
7.contains exons
A. mRNA - 6. specifies the amino acid sequence for a protein
B. rRNA - 4. is the most abundant form of RNA, 3. is assembled in the nucleolus, 5. is a component of ribosomes
C. tRNA - 1. contains an anticodon, 2. has amino acids covalently attached, 7. contains exons
Extra Explanation:
Ribonucleic acids (RNA) are biomolecules that are involved in many important biological processes in living organisms. There are three main types of RNA: ribosomal RNA (rRNA), messenger RNA (mRNA), and transfer RNA (tRNA). Each type of RNA has unique characteristics and functions.
1. rRNA is the most abundant form of RNA in the cell, and it is a component of ribosomes, which are the cellular structures that are involved in protein synthesis. rRNA is assembled in the nucleolus, a specialized region of the cell nucleus.
2. mRNA carries the genetic information that specifies the amino acid sequence of a protein from the nucleus to the ribosomes, where it is translated into a protein. mRNA contains exons, which are the coding regions of the gene, and introns, which are non-coding regions that are spliced out before the mRNA is translated into a protein.
3. tRNA is a small RNA molecule that has an anticodon, which is a sequence of three nucleotides that is complementary to the codon on the mRNA. tRNA also has amino acids covalently attached to it, and it brings the correct amino acid to the ribosome during protein synthesis.
Which of the following items are pure elements—that is, made up of only one type of atom?
A. Cake
B. Iron
C. Hydrogen
Answer:
Explanation:
Cake: Its a mixture. Reason : Cake contain various ingredient which can act as compound alone and on mixing these compound properties of each compound remain the same even after the formation of cake.
Iron : Iron has four naturally-occurring stable isotopes, 54Fe, 56Fe, 57Fe and 58Fe
Hydrogen : The hydrogen atom is the simplest of all atoms: it consists of a single proton and a single electron. In addition to the most common form of the hydrogen atom that is called protium, two other isotopes of hydrogen exist: deuterium and tritium.
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