19.1

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The condensed chromosomes observed in mitosis include all of the following structures except

e. ribosomes.

Under the electron microscope, unfolded chromatin resembles "beads on a string." What do the "beads" represent?

a. nucleosomes

In a nucleosome, what is the DNA wrapped around?

a. nucleosomes

Which of the following statements concerning the eukaryotic chromosome is false?

a. nucleosomes

If a cell were unable to produce histone proteins, which of the following would be expected to occur?

b. The cell's DNA couldn't be packed into its nucleus.

Which of the following statements about histones is incorrect?

b. The cell's DNA couldn't be packed into its nucleus.

Which of the following statements about histones is incorrect?

a. Histones are positively charged, and DNA is negatively charged.

Which of the following represents an order of increasingly higher levels of organization?

a. nucleosome, 30-nm chromatin fiber, looped domain

Which of the following statements is true?

c. Heterochromatin is highly condensed, whereas euchromatin is less compact.

Which of the following is least related to the others?

b. pseudo genes

In a nucleosome, the DNA is wrapped around

c. histones.

Muscle cells and nerve cells in one species of animal owe their differences in structure to

d. differential gene expression.

Which of the following mechanisms is (are) used to coordinately control the expression of multiple, related genes in eukaryotic cells?

a. organization of the genes into clusters, with local chromatin structures influencing the expression of all the genes at once

In which of the following would you expect to find the most methylation of DNA?

d. globin genes

If you were to observe the activity of methylated DNA, you would expect it to

c. have turned off or slowed down the process of transcription.

Genomic imprinting, DNA methylation, and histone acetylation are all examples of

A eukaryotic gene typically has all of the following features except

A eukaryotic gene typically has all of the following features except

c. an operator.

Approximately what proportion of the DNA in the human genome codes for proteins or functional RNA?

e. 2%

Two potential devices that eukaryotic cells use to regulate transcription are DNA ____ and histone ____.

d. methylation; acetylation

In both eukaryotes and prokaryotes, gene expression is primarily regulated at the level of

a. transcription.

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