Considering that in Arabidopsis thaliana, the approximate number of nucleosomes per nucleus is 5 × 10 5 in G1 phase of the cell cycle, answer the following questions: How many nucleosomes are expected in the nucleus after completion of S phase? Explain. Are all of the additional nucleosomes that are present after completion of S phase of the cell cycle composed of newly synthesized histone proteins? Explain. Introduction: During the S phase of the cell cycle, the DNA content of the cell is doubled by the replication of DNA . This replication results in each chromosome containing two identical sister chromatids. The newly synthesized DNA is organized by nucleosome core particles. The nucleosome is wrapped by core DNA and the spans between nucleosomes consist of linker DNA.

Question

Want to see the full answer?

Answer 1

Question

Chapter 11, Problem 18P

Summary Introduction

To analyze:

Considering that in Arabidopsis thaliana, the approximate number of nucleosomes per nucleus is 5×105 in G1 phase of the cell cycle, answer the following questions:

How many nucleosomes are expected in the nucleus after completion of S phase? Explain.

Are all of the additional nucleosomes that are present after completion of S phase of the cell cycle composed of newly synthesized histone proteins? Explain.

Introduction:

During the S phase of the cell cycle, the DNA content of the cell is doubled by the replication of DNA. This replication results in each chromosome containing two identical sister chromatids. The newly synthesized DNA is organized by nucleosome core particles. The nucleosome is wrapped by core DNA and the spans between nucleosomes consist of linker DNA.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

A previously undiscovered single-cell organism was found living at a great depth on the ocean floor. Its nucleus contained only a single linear chromosome with 7 x 106 nucleotide pairs of DNA coalesced with three types of histone-like proteins. Consider the following questions: Question: The analysis of individual nucleosomes reveals that each unit contained one copy of each protein and that the shortlinker DNA contained no protein bound to it. If the entirechromosome consists of nucleosomes (discounting any linkerDNA), how many are there, and how many total proteins areneeded to form them?

This is a three part question: Mitosis and meiosis are both processes of eukaryotic cell division, with the same names used to describe different stags. a. What are the significant cellular and chromosomal events that occur during each stage of mitosis? b. What are the similarities and differences between the events that occur during each stage of mitosis and the corresponding stage of meiosis I? c. What are the similarities and differences between the events that occur during each stage of mitosis and the corresponding stage of meiosis II?

Mitotic nondisjunction can occur, particularly in tumor cells. Assume a single nondisjunction event involving the X chromosome occurs in a cell undergoing mitosis in a human female. First, consider the daughter cell with the smaller number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have? Next, consider the daughter cell with the larger number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have?