Answer: All cells share four common components: (1) a plasma membrane, an outer covering that separates the cell's interior from its surrounding environment; (2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; (3) DNA, the genetic material of the cell; and (4). The cells of most Chlamydomonas species are more or less oval and feature a noncellulosic membrane (theca), a stigma (eyespot), and a usually cup-shaped chloroplast. Although photosynthesis occurs, nutrients also may be absorbed through the cell surface. Asexual reproduction is by zoospores. The filamentous masses come to the surface and become visible as slimy green mats. Spirogyra has a cell wall, nucleus, pyrenoid and spiral chloroplasts. This Elodea leaf cell exemplifies a typical plant cell. It has a nucleus, and a stiff cell wall which gives the cell its box-like shape. The numerous green chloroplasts allow the cell to make its own food (by photosynthesis). The central vacuole takes up most of the volume of the cell. Squamous cells tend to have horizontally flattened, nearly oval-shaped nuclei because of the thin, flattened form of the cell. Squamous epithelium is found lining surfaces such as skin or alveoli in the lung, enabling simple passive diffusion as also found in the alveolar epithelium in the lungs. brainliest?
Explanation:
in developing countries, which of the following is predicted to happen to both population and demand for meat and milk?
A. it will double by 2050
B. it will decrease by 2050
C. it will stay the same in 2050
D. it will increase slightly by 2050
What features of eukaryotes provide additional opportunities for the regulation of gene expression compared to bacteria? Select all that apply. Select all that apply. interaction with external environment transcription and translation are coupled processes separated processes of transcription and translation presence of chromatin opportunity for posttranscriptional and pre-translational regulation activation of all genes in genome
Answer:
separated processes of transcription and translation presence of chromatin opportunity for posttranscriptional and pre-translational regulationExplanation:
Since there is no nucleus surrounding the genetic material in prokaryote cells, the transcription and translation processes occur simultaneously. Transcription stops when a protein is not necessary. So the control of protein synthesis is regulated by transcription and not translation. Once the transcription is on, all the following steps must follow it.
Transcription is the process that controls the genic expression in bacteria.
Eukaryotes do possess a nuclear membrane that separates the genetic material from the rest of the cell. The transcription process occurs inside the nucleus membrane, while the translation process occurs outside. In the cytoplasm occur the translation process and protein synthesis. Genic regulation can happen in any of these processes in different regions of the cells.
In eukaryotes, the regulation of the genic expression control might happen at different levels:
Epigenetic level: When DNA molecules open and nucleosomes separate to join the transcriptional factorsTranscription level: When the messenger RNA is being transcriptedPost-transcription level: When mRNA goes to the cytoplasm Translation level: During the protein elongationPost-translation level: Once the protein synthesis is over.At times during a month, there is no moon visible from earth, even on a clear night. Which phase of the moon is this?
o third quarter moon
O full moon
O first quarter moon
O new moon
the specialised cells of the testes that secrete the male hormone are?
A Sertoli cells
B Acrosomes
C Leydig cells
D Seminal vesicles
How many hydrogen bonds are present in the base pairing of guanine and cytosine?
3
Answer:
3 Hydrogen bonds
Explanation:
Cytosine and guanine pairing can be found in both DNA and DNA-RNA hybrid formed during replication and transcription. The two nitrogenous bases are held together by three hydrogen bonds.
What are examples of convections currents? What are examples of convection currents? A: the movement of war air into cooler air and cooler air into warmer air B: the movement of cool water into warmer water and warmer water into cool water. C: the displacement of air/water molecules by other air/water molecules due to varying temperatures. D: all of the above
Answer:
C: the displacement of air/water molecules by other air/water molecules due to varying temperatures
Cytokinesis in animal cells is accomplished by constriction of the cell along the plane of cell division (formation of a cleavage furrow).
a. True
b. False
Answer:
A) True
Explanation:
Cytokinesis can be regarded as a physical process which brings about cell division, that enables division of cytoplasm of parental cell and turn it two daughter cells. It can take place with both mitosis and meiosis concurrently which are nuclear division that occurs in animal cells. Cytokinesis In animal cells can be achieved as a result of of formation of cleavage furrow by a contractile ring of microtubules of the cell, which brings about division of cell membrane to half.
The microtubules which is utilized during cytokinesis are ones that are been generated at early stages of division and they have a part to play in the restructuring of the new cell
Which of the following which of the following organism would be in the first trophic
level?
a caterpillar
b mouse
C bee
d maple tree
Answer:
D
Explanation:
The first trophic level is the producer, which makes its own food, so it has to be a plant / algae / cyanobacteria
answer and show proof for brainliest
Answer:
C- South America. Because South America is mostly rain forest and forests in the northern and mid section of it.
Explanation:
Please help, A, B,C, or D?
Answer:
I cant see the pic??
Explanation:
Osmotic pressure is: the pressure required to stop the flow of solvent from a region of high solute concentration to a region of low solute concentration. the pressure required to stop the rupture of the semipermeable membrane. the pressure required to reverse the flow of solvent through a semipermeable membrane during osmosis. the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration. None of these
Answer:
the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration.
Explanation:
Osmosis is the movement of water (solvent molecule) from a region of low solute concentration to a region of high solute concentration via a semipermeable membrane.
Osmotic pressure is the pressure (force) applied to a given solvent in order to prevent it's movement via osmosis across a semipermeable membrane. Since, osmotic pressure is the pressure required to stop osmotic process, then it can be further defined as follows:
Osmotic pressure is the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration.
which role do plants play in the nitrogen cycle?
Answer:
C .they take up the usable forms of nitrogen found in the soil .
Explanation:
Which is not a part of the digestive system?
A. Large Intestine
B. Small Intestine
C. Trachea
D. Esophagus
In pea plants, purple flowers (P) are dominant over white flowers (P). If two heterozygous purple flowered plants are
crossed with each other, then what are the possible genotypes of the offspring?
0
Answer is pp only
Answer :the answer is D
Explanation:
are plasmids plant,animal or bacteria cell?
Answer:
Bacteria
Explanation:
A plasmid is a small, often circular DNA molecule found in bacteria and other cells. Plasmids are separate from the bacterial chromosome and replicate independently of it. They generally carry only a small number of genes, notably some associated with antibiotic resistance.
Both Mrs. Smith and Mrs. Jones had babies the same day in the same hospital. Mrs. Smith took home a baby girl named Shirley. Mrs. Jones took home a baby girl named Jane. Mrs. Jones began to suspect, however, that her baby had been accidently been switched with the Smith baby in the nursery. Blood tests were made. Mr. Smith was blood type A, Mrs. Smith was type B, Mr. Jones was type A, Mrs. Jones was type A. Shirley was type O, and Jane was type B. Had a mix-up occurred? SHOW WORK!
Answer:
yes a mixup had occured because two A blood types would result in a baby with the same blood unle mr.jones wasnt the father
Explanation:
In the digestive system, what part of the body precedes the large intestine?
O A. Esophagus
OB. Stomach
O C. Small intestine
O D. Mouth
In the digestive system, small intestine of the body precedes the large intestine. Therefore, option (C) is correct.
What is small intestine?The small intestine is a long, narrow tube-like organ that is part of the digestive system in humans and other animals. It is located in the abdominal cavity between the stomach and the large intestine, and is approximately 6 meters (20 feet) long in adult humans.
The primary function of the small intestine is to digest and absorb nutrients from food. It accomplishes this through the action of enzymes and other digestive secretions produced by the pancreas and liver, as well as through the action of tiny finger-like projections called villi and microvilli that line the intestinal walls. These structures increase the surface area of the small intestine, allowing for efficient absorption of nutrients into the bloodstream.
The small intestine plays a critical role in maintaining overall health and well-being by ensuring that the body receives the necessary nutrients to support its various functions.
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Compare the reproduction in Hydra and Amoeba?
Answer:
Hydra:
Reproduction by budding in Hydra.
Amoeba:
Reproduction by binary fission in Amoeba.
Hydra:
Budding means sexual reproduction in which a new organism develops from a bud in the parent.
Amoeba:
Binary fission is the type of asexual reproduction in which the parent divides to give rise to two daughter organisms.
Hydra:
In budding process, bud is simply an outgrowth of cells at one particular site.
Amoeba:
The parent replicates its genetic material and divides it equally between the two daughters in binary fission.
Hydra:
The bud or the newly formed organism remains attached to its parent until maturation.
Amoeba:
Both the cytoplasm and the nucleus of the parent divides into two.
How can a small mutation provide a small advantage to an organism?
Answer:
It provides an advantage because the mutation could be anything, which may give the organism an advantage no matter how random the mutation is, which it has to somewhat help that organism in life.
Hope this helps!
As a discussed in the lesson, eukaryotic cels are differ from prokaryotic cells based on what three things?
Answer:
Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes, but a eukaryotic cell is typically larger than a prokaryotic cell, has a true nucleus (meaning its DNA is surrounded by a membrane), and has other membrane-bound organelles that allow for compartmentalization of functions
extrusive rocks have larger grains than intrusive rocks.true or false and why
False because extrusive rocks have fine-grained texture due to the rapid cooling of magna above the earth surface. On the other hand extrusive rocks have course grained texture due to slow cooling of magna beneath the Earth's surface
Mendel was a careful researcher who studied the inheritance of certain traits in garden peas. What are some of the research practices Mendel used? Choose all that apply.
A. He crossed true-breeding pea plants.
B. He allowed eggs to be fertilized only by self-pollination.
C. He analyzed his data mathematically.
D. He controlled variables by studying one or two traits at a time.
The research practices Mendel used is applies including A, B and C.
What is Mendel's experiment?
Mendel studied inheritance in peas (Pisum sativum). He chose peas because pea plant are easy to grow and can be sown each year. Pea flowers contain both male and female parts, called stamen and stigma, and can usually self-pollinate.
Mendel studied the inheritance of 7 traits in pea plants including height, flower color, seed color, and seed shape and each trait had 2 forms. He identified pure-breeding pea plants that consistently showed 1 form of a trait after generations of self-pollination.
Mendel proposed a theory of inheritance, based upon the observed data during his experiments, and a mathematical analysis of his results,
Thus, from above, the correct options include A, B and C whereas D doesnt apply because Mendel studied 7 traits at a time.
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What is the formula to find out the energy when given the energy?
Which of the following fresh water biomes consists of moving water
Answer:
Biomes consists of moving water is estuaries.
How Much Of The Suns Energy That Comes To Earth Is Used In Photosynthesis? What Happened To The Rest Of The Energy?
Answer:
Of all the energy that does reach Earth, slightly less than 34 percent is reflected back to space by clouds. The Earth itself reflects another 66 percent back to space. Less than one percent of the total energy that reaches Earth is used by plants for photosynthesis.
Explanation:
Diabetes is a disorder of which body part? O the adrenal gland the thyroid the pancreas the liver
Answer:
The pancreas
Explanation:
it happens when the pancreas doesnt produce enough of something called insulin
Identify the true statements regarding liver glycogen phosphorylase a. Protein phosphatase 1 is abbreviated PP1. The binding of glucose to liver phosphorylase a shifts the equilibrium from the active form to the inactive form. Liver phosphorylase a concentration decreases when glucose enters the blood. As the concentration of phosphorylase a decreases, the activity of glycogen synthase increases. Liver phosphorylase a is regulated by AMP, adenosine monophosphate. When PP1 is bound to phosphorylase a, both PP1 and phosphorylase a are active.
Answer:
Liver phosphorylase a concentration decreases when glucose enters the blood.
The binding of glucose to liver phosphorylase a shifts the equilibrium from the active form
As the concentration of phosphorylase a decreases, the activity of glycogen synthase increases. to the inactive form
Explanation:
Protein phosphatase 1 (PP1) is a phosphatase enzyme known to remove phosphate groups from serine/threonine amino acid residues. PP1 plays diverse biological roles including, among others, cell progression, control of glucose metabolism, muscle contraction, etc. In glucose metabolism, PP1 regulates diverse glycogen metabolizing enzymes (e.g., glycogen synthase, glycogen phosphorylase, etc). In the liver, glycogen phosphorylase catalyzes the rate-limiting step in glycogenolysis by releasing glucose-1-phosphate. Glycogen phosphorylase a is converted (and inactivated) into the b form by PP1, which catalyzes the hydrolysis of the phosphate bond between serine and the phosphoryl group. In the liver, glucose binds in order to inhibit glycogen phosphorylase a, thereby inducing the dissociation and activation of PP1 from glycogen phosphorylase a.
You have two fly lines carrying two different alleles of white, called wco (coral) and wch (cherry). Coral and cherry are in the same complementation group and exhibit NO complementation. Which is true regarding recombination between these alleles in a cross:
a. recombination is never observed because coral and cherry are in the same complementation group
b. recombination is impossible because they are in the same gene (white)
c. recombination is never observed because coral and cherry display the same phenotype
d. recombination is possible and can generate a wild-type allele and a double mutant allele
Answer:
Recombination is possible and can generate a wild-type allele and a double mutant allele ( D )
Explanation:
The true statement regarding the recombination between the alleles is : Recombination is possible and can generate a wild-type allele and a double mutant allele.
The recombination process involves the breaking and recombination of pieces of DNA in order to produce new alleles. this recombination ( crossover ) results to the offspring possessing different combination of genes ( wild -type allele and double mutant allele ). hence option D is the correct answer.
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Mitochondria: source of energy to cell
Nucleus: contains dna and controls center
Ribosomes: produces protein
Cell membrane: gives protection
5. How does the current leaving the cell in a parallel circuit compare
with the current in a series circuit, if both circuits have the same
type of cell and the same number of identical flashlight bulbs?
Answer:
circuit compare
with the current in a series circuit, if both circuits have the same
type of cell and the same number of identical flashlight bulbs?