The only cells that undergo meiosis are egg mother cells (oocytes) in the ovaries and sperm mother cells (spermatocytes) in the testes.
What is meiosis?Meiosis is a unique type of cell division in which the number of chromosomes is cut in half. Oogenesis and spermatogenesis are the terms used to describe the processes of egg and sperm production.
What exactly are oocytes?In the process of human reproduction, there are two different kinds of sex cells, or gametes. The male gamete, or sperm, and the female gamete, the egg or ovum, combine in the female reproductive system. The fertilized egg produced by the union of a sperm and an egg is termed as a zygote. They are diploid in nature(2n).
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DNA molecule has 180 base pairs(A=T) and 20% A. How many C nucleotides are present in this molecule of DNA?
Answer: 53 Cytosine
Explanation:
Let x equal C nucleotides
20% of Adenine = 20% of Thymine20% + 20% = 40%100% - 40% = 60 %60% = Cytosine and GuanineCytosine and Guanine will always have the same amount 30% of Cytosine180 * 0.3 = 5353 Cytosine nucleotidesDuring the assessment of a patient with a brain abscess, the nurse notes elevated blood pressure and altered level of consciousness. Which additional symptoms should the nurse assess for?.
Symptoms may vary depending on the location of the brain abscess. It includes headache and nausea due to increased pressure in the brain. Neurological symptoms may also be present but in very rare cases.
Common symptoms of the disease are fever, headache, and nervous system problems such as confusion, difficulty in speech or walking change and arm/ leg weakness on one side.
Brain abscess is a collection of pus that develops in the brain due to an infection. Causes of this disease are infections in other parts of the body or improper functioning of immune system.
Treatment for this are antibiotics and close monitoring. In some cases, the abscess has to be removed surgically.
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What is effect of external temperature on body variables i.e. Temperature, body fluid, ph etc.
A. They tend to increase
B. They tend to decrease
C. Both a and b
D. No effect at all
The effect of external temperature on body variables like temperature, body fluid, ph etc is No effect at all; option D.
What are variables?Variables are measurable factors or quantities which are subject to change.
Variables are important in research and experiments.
In the human body, various measurable variables exist. some of these variables include temperature, body fluid, pH etc.
The body has a mechanism for maintaining a fairly constant internal environment despite challenges i the external environment.
This s known as homeostasis.
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What is the MAIN function of carbohydrates?
A. To provide structure and support
B. To make enzymes
C. To provide short term energy
If the conservative model had been correct, how many generations of bacterial cell division would have had to pass before meselson and stahl would have observed evidence of a band in the cscl gradient corresponding to a hybrid dna molecule containing both 14n and 15n?.
If the conservative model had been correct, No generations; a hybrid would never form had to pass before meselson and stahl would have observed evidence of a band in the cscl gradient corresponding to a hybrid dna molecule containing both 14n and 15n.
What is the Meselson and Stahl experiment about?
In 1958, Matthew Meselson and Franklin Stahl using three models of conservative, semi conservative and dispersive of how organisms might replicate their DNA for their experiment were able to show that each strand in a DNA molecule serves as a template for synthesis of a new, complementary strand.
Here's the complete question:
If the conservative model had been correct, how many generations of bacterial cell division would have had to pass before Meselson and Stahl would have observed evidence of a band in the CsCl gradient corresponding to a hybrid DNA molecule containing both 14N and 15N?
A) 1 generation
B) 4 generations
C) More than 10 generations
D) No generations; a hybrid would never form.
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Hi~-------- H-a-l-p for a cookie :) Pleaseeee try to get it right Thxxx :))))) Brainliest to correct answr
Answer:
Answer is D
Prokaryotic cells and Rukaryotic cells both have cell membranes, genetical material, ribosomes, and cytoplasm
Answer:
D) passed the test
Explanation:
Bile is stored and concentrated in the _____.
A: Duodenum
B: Appendix
C: Gall Blander
D: Cecum
What type of lipid polymer make up a hormone
Answer: Cholesterol i believe
Explanation:
What are the four major categories of organic compounds?
a
point)
с
acids, bases, nucleic acids, and polysaccharides
carbohydrates, lipids, nucleic acids, and proteins
carbon, hydrogen, nitrogen, and oxygen
all of the above
Answer:carbohydrates, lipids, proteins, and nucleotides.
Explanation:
A scientist discovers a new molecule that is a long polymer that consists of a single strand of nucleotides. What type of molecule did the scientist most likely find?.
The big molecules that make up this polymer must have repeating units.
A polymer is made up of lengthy chains of monomers, which are smaller repeating units.
For instance, long chains of ethylene (CH2=CH2) molecules are connected end to end to form polyethylene.
Polyethylene's chemical formula is -CH2CH2-(CH2CH2)n-CH2CH2-, where n is typically a figure between 500 and 10,000.
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What type of force does the water exert on the planes floats, which cause the motion of plane to slow?
a new restriction endonuclease is isolated from a bacterium. this enzyme cuts dna into fragments that average 4,096 base pairs long. like many other known restriction enzymes, the new one recognizes a sequence in dna that has twofold rotational symmetry. from the information given, how many base pairs of dna constitute the recognition sequence for the new enzyme?
For the identification of cleavage or cutting capacity of the particular newly isolated restriction endonuclease enzyme, we can provide the entire known nucleotide sequence during restriction activity, after that we can do sequencing for the analysis of at which specific position DNA is cutting down by that particular restriction enzyme.
Sequencing is the method used to know the genomics size of long as well as short stretch of DNA results in a shorter time period. There are two types of sequencing, first is ancient sequencing techniques such as Sanger sequencing and second one is next generation sequencing. Nowadays the next generation sequencing method is widely used for sequencing. These next generation sequencing is totally based on computer based technique.
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Nicotine triggers the release of adrenaline. What negative impact does this have on the cardiovascular system?.
Nicotine causes the narrowing of arteries, an increase in blood pressure, and an increase in heart rate.
Nicotine is a harmful chemical present in cigarettes and tobacco products. this chemical triggers the release of adrenaline. This hormone is known to give a "kick" to the body's systems.
Prolonged usage of nicotine has a severe impact on the body especially the respiratory and cardiovascular systems. The hormone, adrenaline, is known to increase the heart rate and flow of blood. this increases the blood pressure and narrowing of blood vessels which in turn increases the risk of heart attacks, cardiac arrest, and a variety of heart issues.
So, nicotine is a harmful chemical that causes a wide range of health complications in the long run.
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What two scientists are responsible for saying plants and animals are made of cells leading to the development of the Cell Theory?
Group of answer choices
Schleiden
Hooke
Zaccharius Janssen
Leeuwenhoek
Schwann
Hans Janssen
Answer:
The answer is Theodore Schwann and Mattias Schleiden
Explanation:
They studied cells of plants and animals respectively. These scientists identified key differences between the two cell types and put forth the idea that cell were fundamental units of both plants and animal .
describe how leaves undergo photosynthesis underwater use the chemical reaction for photosynthesis to help answer
Answer:
In photosynthesis, multiple molecules of carbon dioxide are combined to produce glucose using energy from sunlight. Terrestrial plants obtain carbon dioxide for this process from the atmosphere, as carbon dioxide gas is abundantly present in the air. However, carbon dioxide can also dissolve in water, and aquatic plants obtain carbon dioxide directly from the water that surrounds them. This allows aquatic plants like seaweed and many others to obtain energy from sunlight.
does light need matter to travel
Answer:
Light travels as a wave. But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space.
please help me!!! it not that hard i just don’t know the answer
Eukaryotes frequently have several cells, but prokaryotes are invariably unicellular. Eukaryotic cells are also between 100 to 10,000 times bigger and more complicated than prokaryotic cells. Prokaryotic DNA is kept in the cytoplasm, whereas DNA in eukaryotes is kept in the nucleus.
What is the difference between prokaryotic and eukaryotic cells?Eukaryotes frequently have several cells, but prokaryotes are invariably unicellular. Eukaryotic cells are also between 100 to 10,000 times bigger and more complicated than prokaryotic cells. Prokaryotic DNA is kept in the cytoplasm, whereas DNA in eukaryotes is kept in the nucleus.
Within eukaryotes, organelles perform specialized tasks such as energy production, photosynthesis, and membrane synthesis. The majority of them are membrane-bound structures that serve as the locations of particular metabolic reactions.
They are capable of breathing, digesting, and other biological functions. Being single-celled organisms, prokaryotic cells carry out all of these tasks in a single cell.
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explain how competition can affect an organisms niche
Answer:
The competitive exclusion principle says that two species can't coexist if they occupy exactly the same niche (competing for identical resources). Two species whose niches overlap may evolve by natural selection to have more distinct niches, resulting in resource partitioning.
Competition influences an organism's niche by shaping its resource utilization, spatial distribution, and evolutionary adaptations. It drives species to adapt and specialize, facilitating coexistence and maintaining the balance of ecological communities.
Competition plays a significant role in shaping an organism's niche, which refers to the specific role and position it occupies within its environment. Here's how competition can affect an organism's niche:
Resource Competition: Organisms often compete for limited resources such as food, water, shelter, or mates. When resources are scarce, intense competition can occur, forcing organisms to adapt their niche to gain access to these resources. This can lead to specialization, where organisms develop specific traits or behaviors to exploit specific resources and reduce competition.Competitive Exclusion: Intense competition can result in competitive exclusion, where one species outcompetes another for the same resources. This can lead to the displacement or elimination of the less competitive species from that particular niche. As a result, the winning species can expand its niche and occupy a broader range of resources.Niche Partitioning: In order to coexist and reduce competition, similar species may partition their niches by dividing the available resources. Each species may specialize in utilizing different resources or occupy different microhabitats within the same ecosystem. This allows for the coexistence of multiple species with similar requirements.Competitive Interactions: Competition can also drive evolutionary changes in organisms. Over time, species may evolve different traits or behaviors that give them a competitive advantage in accessing resources or avoiding competition. This can lead to the diversification of niches within a community, as species adapt to occupy different ecological roles.Learn more about Competition, here:
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How does added heat affect the temperature of water over time as it changes from a solid to gas
Answer:Si se disminuye la temperatura de una sustancia líquida esta puede cambiar a estado sólido. El agua es una sustancia que siempre conserva su forma y su volumen sin importar el estado en el que esté. Cuando se cambia la temperatura a la que se expone el agua, esta puede cambiar sus estados: Sólido, líquido o gaseoso.
Explanation:
Which substance does ATP synthase add to molecules of ADP?
A. ATP molecules
B. Electrons (7)
C. Phosphate (P) groups
D. Hydrogen ions (H+)
SUBMI
Answer:"C" Phosphate
Explanation:
in the meselson-stahl experiment, after the first round of dna replication, the model was eliminated because band(s) was/were seen in the tube after density gradient centrifugation.
The heavy 15N model was eliminated because light 14N band(s) was/were seen in the tube after density gradient centrifugation in the meselson-stahl experiment.
The best model for DNA replication was determined by an experiment designed by Matthew Meselson and Franklin Stahl in 1958. For several generations, they raised E. coli in a medium that contained a heavy nitrogen isotope (15N), which was incorporated into nitrogenous bases and eventually into the DNA. The parental DNA was marked by this. After that, the E. coli culture was moved into a medium containing 14N and left to develop for one generation. DNA was isolated when the cells were harvested.
Through the process of ultracentrifugation, the DNA was divided into bands based on the density of the DNA. It would be expected that DNA produced in 15N will form a band at a place with a higher density than DNA grown in 14N. Meselson and Stahl discovered that the solitary band seen after one generation of growth in 14N was positioned halfway between the DNA of cells grown exclusively in 15N or 14N. This indicated either a dispersive or a semiconservative form of reproduction.
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Taxol is an anticancer drug extracted from the pacific yew tree that binds to microtubules and prevents their depolymerization. Which phase of mitosis or cell division would be inhibited by treatment with taxol?.
Answer:
I DON'T KNOW if my answer is correct but here is the answer
Explanation:
Taxol blocked cell cycle progress at the metaphase/anaphase transition and inhibited cell proliferation.
Where does sex cells form?
Meiosis is a process by which sex cells are produced.
The emergence of sex cells is a central part of human reproduction: In fertilization, an egg cell and a sperm cell merge. These sex cells are also called reproductive cells or gametes. Sperm cells are built in men's testicles and egg cells are produced in women's ovaries. In the human reproductive process, two kinds of sex cells, or gametes are involved. The male gamete, or sperm, and the female gamete, Gametes serve two functions. They have the physiological ability to fuse with a gamete from the opposite sex cells and form a single cell.
So we can conclude that human sex cells are produced by the process of meiosis.
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a concentration gradient of chloride ions (cl-) exists across a cell membrane with a higher concentration of cl- outside the cell. in response to this concentration gradient, water moves out of the cell to equalize the gradient. what term best describes this process:
Water moves out of the cellular to equalize the gradient. what term pleasant describes this system: both the concentration gradient and electric gradient prefer the movement of Cl- ions into the mobile.
The attention of the answer tells you the way a lot of solutes have been dissolved within the solvent. as an example, if you add one teaspoon to two cups of water, the concentration could be said as 1 t salt per 2 c water.In chemistry, concentration refers to the amount of a substance in a defined space. any other definition is that attention is the ratio of solute in an option to both solvent or overall solution. concentration is typically expressed in terms of mass in step with unit extent.
Excessive attention way the density of the material is extra than what surrounds it. that is in evaluation to a lower concentration wherein the density of material could be much less. that is helpful in explaining the natural movement of materials because they clearly flow from high concentration to decrease.
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a study of the effects of damaging toxins on cells and tissue identifies ubiquitin as a key molecule. can you explain why ubiquitin would be associated with toxin damage?
Answer:
Damaged proteins are tagged with ubiquitin for degradation
What is an example of how gender ideology is often reflected in gender stereotypes?.
Descriptions of the roles of egg and sperm in college biology textbooks published during the early 1990s
What are gender stereotypes?
A gender stereotype is a preconceived notion about the features or characteristics that women and men possess or should possess or the roles that women and men should or should not do. Positive and negative gender stereotypes exist, such as "women are nurturing" and "women are weak."
Hence, descriptions of the roles of egg and sperm in biology textbooks are an example of how gender ideology is often reflected in gender stereotypes.
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The structure in the brain that, when damaged, causes rats to eat and eat and eat is called the __________.
Answer:
Ventromedial hypothalamus
Explanation: When the ventromedial hypothalamus is damaged, an individual cannot feel sated after eating. This lack of satiety causes excessive hunger, and overeating. Hope this helped :)
Select the type of inheritance pattern that is best described below:
In rabbits, an allele for full color ( C ) is dominant over an allele for chinchilla (c’) color. Both full color and chinchilla are dominant over the white allele ( c ). A rabbit can be CC, Cc’, Cc, c’c’, c’c, or cc.
a. Codominance
b. Incomplete Dominance
c. Multiple Alleles
d. Pleiotropy
e. Polygenic Inheritance
We can see that the rabbit from the description shows the pattern called multiple alleles.
What are alleles?According to Mendel genetics, we know that the factor that determines the inheritance pattern of an organism is called the gene. The genes re located in the chromosomes. It is common to find out that it is not a single gene that controls the inheritance of a given trait.
Now we can see that a rabbit can be CC, Cc’, Cc, c’c’, c’c, or cc. This implies that more than on allele does control the expressed trait and this is an example of multiple allele.
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i need help i have to submit in 20 minutes!!!
Answer:
Cell 1
Explanation:
The Golgi Complex is responsible for sorting and packaging proteins and lipids.
Answer:
A. Cell 1
Explanation:
The Golgi apparatus is located at the base of the cell and serves as a place where proteins are added to lipids, which are then transported to other parts of the cell. It also contains enzymes that break down proteins, carbohydrates and lipids. The Golgi apparatus can be found in most eukaryotic cells.
according to most scholars, life expectancy in the united states increased dramatically after 1900 because of group of answer choices the introduction of smallpox inoculation. the development of new medical treatments. changes in nutrition and living conditions. the natural evolution of epidemics. the natural evolution of microorganisms into less dangerous forms.
According to most scholars, life expectancy in the united states increased dramatically after 1900 because of changes in nutrition and living conditions and is denoted as option C.
What is Life expectancy?This is a term which is used to depict the statistical measure of the average time an organism is expected to live and is based on various types of factors such as the gender, age etc.
In the late 1900, there was an increase in the life expectancy because of the different forms of developments and technological innovations which were done.
Other reasons which led to it increasing drastically in the United states after 1900 was because of the changes in nutrition and living conditions which is therefore the reason why it was chosen as the correct choice.
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