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Chapter 10: Q. 5 (page 276)

The first level of DNA organization in a eukaryotic cell is maintained by which molecule?

a. cohesin

b. condensin

c. chromatin

d. histone

Short Answer

Expert verified

The correct option is D.

Step by step solution

01

Step. 1 Introduction

DNA is comprised of two antiparallel strands comprising nucleic acids, each one contains two linked and opposing nucleic acids known as DNA bases. Every strand of DNA is coiled across histones, producing nucleosome complexes, in order for that to fit within the small nucleus of the cell. Chromosome is made mainly of nucleosomes that pack together.

02

Step. 2 Explanation for correct answer

The genetic material DNA in eukaryotic cells is linear and firmly bonded to specific proteins called histones. Histones are basic proteins with a lot of lysine as well as arginine residues that have a lot of evolutionary stability

03

Step. 3 Explanation for incorrect answer

Option A. Sister chromatid stability, reassortment, and DNA folding are all facilitated by cohesin, a protein complex.

Option B. Condensins comprise huge structures that have a key role in mitosis and meiosis chromosomal assembly and division.

Option C. Chromatin is the substance that comprises a chromosome, which is composed of Deoxyribonucleic acid and protein.

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Most popular questions from this chapter

The chromosomes become visible under a light microscope during which stage of mitosis?

a. prophase

b. prometaphase

c. metaphase

d. anaphase

If the M checkpoint is not cleared, what stage of mitosis will be blocked?

a. prophase

b. prometaphase

c. metaphase

d. anaphase

Which negative regulatory molecule can trigger cell suicide (apoptosis) if vital cell cycle events do not occur?

a. p53

b. p21

c. retinoblastoma protein (Rb)

d. cyclin-dependent kinase (Cdk)

Eukaryotic chromosomes are thousands of times longer than a typical cell. Explain how chromosomes can fit inside a eukaryotic nucleus.

Which molecule is a Cdk inhibitor that is controlled by p53?

a. cyclin

b. anti-kinase

c. Rb

d. p21
See all solutions

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