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3 years ago

What does a chromosome consist of?

Biology

2 answers:

Alex3 years ago

8 0

Answer:

Explanation:

So, there are 2 different forms that DNA can be found in.

The more common form, where the DNA is loosly scattered.

There is a less common form, however, only found during cell division, which is a compacted form. The DNA is tighly wound in this case.

In the case of chromosomes, DNA is tightly pakced, and not loose.

Now, do they are do they not have protiens?

Well, heres another question, how does the DNA get compacted?

It has to wrap around histone protiens.

The logn strands of DNA wrap around many histone protiens, until the full length of DNA has been compacted.

So to answer the question, yes, there are protiens found in chromosomes(specificly histone).

This means the answer must be C, since chrosomes are both tightly bound, and contain protein.

azamat3 years ago

5 0

I think C, but I’m not sure.

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3 years ago

Under typical cellular conditions, which enzyme does not catalyze an irreversible reaction in glycolysis?

harina [27]

Phosphoglycerate kinase does not catalyze an irreversible process in glycolysis under normal cellular circumstances.

Discussion about glycolysis:

Ten stages make up the glycolysis process, seven of which are reversible and three of which are practically irreversible. These are the first, third, and final stages that are successively catalyzed by hexokinase, phosphofructokinase, and pyruvate kinase.

During the glycolysis process, glucose 6-phosphate is changed into pyruvate. Everything that happens is cytoplasmic. Fructose 6-phosphate is created by reversible isomerization of glucose 6-phosphate. Physiologically irreversible fructose 6-phosphate phosphorylation to fructose 1,6-bisphosphate is performed by phosphofructokinase.

Hexokinase, phosphofructokinase-1, and pyruvate kinase conduct nearly irreversible events during glycolysis, hence one would anticipate that these enzymes have both regulatory and catalytic functions.

So, option d i.e., phosphoglycerate kinase should be the appropriate response.

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2 years ago

Genetic screening involves

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4 years ago

There are those who claim that the theory of evolution cannot be true because the apes, which are supposed to be closely related

saveliy_v [14]

Answer:

A. Advantageous alleles do not arise on demand.

Explanation:

According to theory of evolution, heritable traits in organisms can change across the generations leading to their evolution. There are many evolutionary forces like natural selection, mutation, genetic drift etc. However, it is incorrect to assume that the advantageous alleles will always be selected in evolution. Accumulation of random mutations, genetic drift or bottle neck effect are independent of this factor. Also, organisms with different degree of beneficial traits can coexist in same time frame. Just because humans evolved in a particular direction does not mean that other organisms will also do so.

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3 years ago

The cellular mechanism that determines the independent assortment of maternal and paternal chromosomes is: Please choose the cor

Ipatiy [6.2K]

Answer:

separation of homologous pairs at anaphase I of meiosis.

Explanation:

Independent assortment law establishes that the alleles from two or more different genes distribute in gametes independently from each other. In other words, a gamete receives an allele from a gene that does not depend or influence the allele of another gene in the same gamete. This random distribution can only be applied to independent genes. These genes segregate independently after crossing over because they are located far away from each other.

When cell division is going on by meiosis, it involves the random and independent segregation of the alleles. During anaphase I (meiosis), the pairs of homologous chromosomes separate independently of each other. Each integrant of the homologous pair migrates to opposite poles of the cell. This separation generates different chromosomal combinations in the daughter cells. The process is as follows.

During metaphase I, homologous pairs together migrate to the equatorial plane, where they randomly aline with their kinetochores facing opposite poles. The random arrangement of tetrads is different in every cell going through the meiosis process. There is no equal alinement between two cells. When tetrads aline in the equatorial plane, there is no predetermined order for each of the homologous chromosomes of each tetrad to face one of the poles and then migrate to it while separating. Any chromosome of the homologous pair might face any of the poles and then migrate to it. Each of the chromosomes has two possibilities for orientation at the plane. During anaphase I, each of the homologous chromosomes migrate to the corresponding pole. When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell. This random order in the equatorial plane is what introduces variation into the gametes. It is almost impossible that two gametes resulting from meiosis will get the same genetic charge.

6 0

3 years ago