Question 1

Which of the following best describes the totality of all genetic material in an organism?

Accepted Answer

The genome

Question 2

In eukaryotic cells, DNA is packaged with proteins to form which structure?

Accepted Answer

Chromatin

Question 3

Which of the following statements about chromosomal territories in the nucleus is TRUE?

Accepted Answer

Each chromosome occupies a distinct region within the nucleus called a territory.

Question 4

Which equation best represents the compaction ratio of eukaryotic DNA during metaphase?

Accepted Answer

$$10,000 	imes$$

Question 5

Which of the following is NOT a function of DNA packaging in eukaryotic cells?

Accepted Answer

Increasing the rate of DNA mutation

Question 6

Which chromatin type is most likely to contain actively expressed genes?

Accepted Answer

Euchromatin

Question 7

What is the primary difference in gene structure between prokaryotes and complex eukaryotes?

Accepted Answer

Eukaryotes have longer genes with multiple exons and introns, and more intergenic regions.

Question 8

Which of the following best explains why prokaryotic chromosomes do not need to be as tightly condensed as eukaryotic chromosomes?

Accepted Answer

Prokaryotes have fewer genes and less DNA, so less compaction is needed.

Question 9

Which of the following is a hallmark of chromosomal rearrangements in leukemia, as seen in chronic myeloid leukemia (CML)?

Accepted Answer

Translocation between chromosomes 9 and 22

Question 10

Which of the following best describes the relationship between gene size and mRNA size in mammals, based on the provided data?

Accepted Answer

Average gene length is much greater than average mRNA length due to the presence of introns.

Question 11

Which of the following is TRUE regarding the packaging of bacterial DNA?

Accepted Answer

Bacterial DNA is circular and compacted by supercoiling and histone-like proteins.

Question 12

Which of the following statements about nucleosomes is correct?

Accepted Answer

Nucleosomes consist of DNA wrapped around a core of eight histone proteins.

Question 13

Which of the following best describes the effect of histone acetylation on chromatin structure?

Accepted Answer

Acetylation causes chromatin to become more open, increasing gene expression.

Question 14

Which of the following is a correct sequence of DNA packaging in eukaryotic cells, from least to most condensed?

Accepted Answer

DNA → nucleosome → chromatin fiber → chromatin loops → metaphase chromosome

Question 15

Which of the following is most likely to be found in heterochromatic regions of a chromosome?

Accepted Answer

Repetitive DNA sequences such as VNTRs

Question 16

Which of the following best explains why metaphase chromosomes are used for karyotyping?

Accepted Answer

Chromosomes are most tightly condensed and easily distinguishable during metaphase.

Question 17

Which of the following statements about intergenic regions is correct?

Accepted Answer

Intergenic regions are non-coding DNA found between genes.

Question 18

Which of the following is TRUE about the organization of protein-coding genes in prokaryotes and eukaryotes?

Accepted Answer

Both contain a coding region, regulatory region, and transcription termination sequence.

Question 19

Which of the following best describes the relationship between gene density and intergenic region size?

Accepted Answer

Gene density is inversely proportional to the size of intergenic regions.

Chromosome Structure and Organization in Prokaryotes and Eukaryotes

Study Guide - Practice Questions