Question

5. During mitosis, chromatin is highly condensed. This tightly packed structure is maintained by A. Inhibition of DNA replication and gene transcription B. Increasing the number of histone proteins in nucleosomes C. Decreasing the number of histone proteins in nucleosomes D. Inactivation of many of the chromatin-remodeling complexes, as well as specific chemical modifications of the histones 6. Which of the following statements is Not correct about X chromosome inactivation in mammal females? A. The two X chromosomes in females have equal chances to be inactivated. B. The inactivation of the X chromosome is constitutive. C. Inactivation of X chromosome is to maintain gene dosage equivalence between male and female. D. The inactivated X chromosome is called a Barr body.

          5. During mitosis, chromatin is highly condensed. This tightly packed structure is maintained by
A. Inhibition of DNA replication and gene transcription
B. Increasing the number of histone proteins in nucleosomes
C. Decreasing the number of histone proteins in nucleosomes
D. Inactivation of many of the chromatin-remodeling complexes, as well as specific chemical
modifications of the histones

6. Which of the following statements is Not correct about X chromosome inactivation in mammal females?
A. The two X chromosomes in females have equal chances to be inactivated.
B. The inactivation of the X chromosome is constitutive.
C. Inactivation of X chromosome is to maintain gene dosage equivalence between male and
female.
D. The inactivated X chromosome is called a Barr body.

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5. During mitosis, chromatin is highly condensed. This tightly packed structure is maintained by
A. Inhibition of DNA replication and gene transcription
B. Increasing the number of histone proteins in nucleosomes
C. Decreasing the number of histone proteins in nucleosomes
D. Inactivation of many of the chromatin-remodeling complexes, as well as specific chemical
modifications of the histones

6. Which of the following statements is Not correct about X chromosome inactivation in mammal females?
A. The two X chromosomes in females have equal chances to be inactivated.
B. The inactivation of the X chromosome is constitutive.
C. Inactivation of X chromosome is to maintain gene dosage equivalence between male and
female.
D. The inactivated X chromosome is called a Barr body.

Added by Shannon L.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Mj A

07/27/2022

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Step 1: In mitosis, chromatin is highly condensed due to the inactivation of chromatin-remodeling complexes, specific chemical modifications of histones, and increased number of histone proteins in nucleosomes. Show more…

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During mitosis, chromatin is highly condensed. This tightly packed structure is maintained by inhibition of DNA replication and gene transcription, increasing the number of histone proteins in nucleosomes, and decreasing the number of histone proteins in nucleosomes. In addition, there is inactivation of many of the chromatin-remodeling complexes, as well as specific chemical modifications of the histones. Which of the following statements is not correct about X chromosome inactivation in mammal females? The two X chromosomes in females have equal chances to be inactivated. The inactivation of the X chromosome is constitutive. Inactivation of the X chromosome is to maintain gene dosage equivalence between male and female. The inactivated X chromosome is called the Barr body.

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Transcript

00:01 Hello, so let's answer now the problem.

00:03 So here in the problem, we have two questions.

00:06 So let's start with question number five.

00:09 So here in the question, in question number five, what is the reason why chromatin will condense into chromosome? so again, during mitosis, we know that chromatin will be condensed into chromosome.

00:38 This tightly packed structure is maintained by what? or what is the reason why this chromatin is condensed? so our answer here is we have, there is an inactivation of many chromatin remodeling complexes, as well.

01:24 Specific chemical modifications of histones okay so this is our answer so chromatin remodeling complexes are a kind of protein machines that use the energy of atp hydrolysis to change the structure of nucleosomes temporarily so that dna become less tightly bound to the histone core so by inactivating it then when the chromatin remodeling complexes is inactivated, then it will become tight, then the chromatin will condense into chromosome.

02:14 Okay, so this is our answer for the first question.

02:16 Let's proceed to number six.

02:19 So we know that in the female cell, there are two chromosomes.

02:27 Okay.

02:28 So there are two chromosomes, sorry, two x chromosomes.

02:36 Rather, two x chromosomes, okay, wait, chromosomes, two x chromosomes in the female cell.

02:55 Now, these two chromosomes, not all of these chromosomes will be activated.

03:04 Only one will be activated and one x chromosome is inactivated...

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