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Chapter 16: 16-5TYU (page 333)

In a nucleosome, the DNA is wrapped around

  1. histones
  2. ribosomes
  3. polymerase molecules
  4. a thymine dimer

Short Answer

Expert verified
  1. The option 鈥渉istones鈥� is true.
  2. The option 鈥渞ibosomes鈥� is false.
  3. The option 鈥減olymerase molecules鈥� is false.
  4. The option 鈥渁 thymine dimer鈥� is false.

Step by step solution

01

DNA

DNA is present in the nucleus, which is the center part of the cell. DNA is a long molecule that contains genes. It is folded compactly to occupy the space within the nucleus.

02

Explanation of option (A)

Histones are the protein molecule that wraps DNA to form nucleosomes. It is a basic unit present in the chromatin. There are eight histones鈥� proteins found.

The wrapping of DNA with the histones takes place to make the DNA structure compact within the nucleus.

Therefore, the given option is true.

03

Explanation of option (B)

The ribosome is an organelle that is the site of protein synthesis found attached to the endoplasmic reticulum. It is a membranous organelle that is connected with the nucleus.

A nucleosome is a structure found inside the nucleus. But the ribosomes are the organelle present in the cytoplasm of the cell.

Therefore, the given option is false.

04

Explanation of option (C)

A polymerase is an enzyme that works in the replication of DNA. It adds nucleotide bases to the newly produced strands.

A polymerase is an enzyme that does not have a connection with nucleosomes.

Therefore, the given option is false.

05

Explanation of option (D)

The thymine dimer structures are formed due to DNA exposure to radiation such as UV rays. Thymine residues present near each other attached via a covalent bond to form a thymine dimer.

Thymine dimer is due to exposure to radiation and is not wrapped with the DNA in the nucleosome.

Therefore, the given option is false.

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Most popular questions from this chapter

Model building can be an important part of the scientific process. The illustration shown above is a computer-generated model of a DNA replication complex. The parental and newly synthesized DNA strands are colour coded differently, as are each of the following three proteins DNA pol III, the sliding clamp, and single-stranded binding protein.

  1. Using what you've learned in this chapter to clarify this model, label each DNA strand and protein.
  2. Draw an arrow to indicate the overall direction of DNA replication.

The elongation of the leading strand during DNA synthesis

  1. progress away from the replication fork.
  2. occurs in the 3鈥�鈫�5鈥�direction.
  3. produces Okazaki fragments.
  4. depends on the action of DNA polymerase.

Describe the structure of a nucleosome, the basic unit of DNA packing in eukaryotic cells.

What role does complementary base pairing play in the replication of DNA?

If the DNA pol I in a given cell were non-functional, how would that affect the synthesis of a leading strand? In the overview box in Figure 16.17, point out where DNA pol I would normally function on the top leading strand.
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