Question 1

Which of the following best explains the c-value paradox observed in eukaryotes?

Accepted Answer

The amount of DNA in an organism's genome does not correlate with its complexity, due to the presence of large amounts of noncoding and repetitive DNA.

Question 2

A plant species has a c-value of 44n. What does this indicate about its genome?

Accepted Answer

It has 44 sets of chromosomes, indicating extreme polyploidy.

Question 3

If a genome contains 47,632 genes and has a gene density of 467 genes/Mb, what is its expected genome size in megabase pairs (Mb)?

Accepted Answer

$$\frac{47,632}{467} = 102 Mb$$

Question 4

Which of the following is a major feature of the S phase of the cell cycle?

Accepted Answer

Synthesis of DNA.

Question 5

During meiosis I, which event is responsible for genetic recombination?

Accepted Answer

Homologous chromosomes synapse and crossing over takes place.

Question 6

Which of the following best describes the difference between tandem and interspersed repeats in the genome?

Accepted Answer

Tandem repeats are adjacent to each other, while interspersed repeats are distributed at various locations throughout the genome.

Question 7

Which type of repetitive DNA is most abundant in the human genome?

Accepted Answer

Long interspersed elements (LINEs)

Question 8

Barbara McClintock's discovery of transposable elements (TEs) led to which major insight about the genome?

Accepted Answer

The genome contains mobile elements that can move and regulate gene expression.

Question 9

Which mechanism allows retrotransposons to increase their copy number more rapidly than DNA transposons?

Accepted Answer

Copy-and-paste mechanism via an RNA intermediate

Question 10

A mutation caused by the insertion of a transposable element into a gene's coding region may result in:

Accepted Answer

Disruption of the gene's normal translation reading frame or premature termination.

Question 11

Which of the following statements about gene density is correct?

Accepted Answer

Gene density is the number of genes per megabase pair of DNA.

Question 12

Which of the following is NOT a plausible effect of transposable element (TE) insertion in a genome?

Accepted Answer

Direct conversion of a protein-coding gene into a centromere.

Question 13

Which stage of the cell cycle is characterized by the alignment of chromosomes on the metaphase plate?

Accepted Answer

Metaphase

Question 14

Which organism is most tolerant of polyploidy, as evidenced by examples such as the black mulberry tree?

Accepted Answer

Plants

Question 15

If the average human protein includes 500 amino acids and requires 1500 nucleotides to encode, how many proteins could theoretically be encoded in a genome of 3.2 billion base pairs?

Accepted Answer

$$\frac{3,200,000,000}{1500} = 2,133,333$$

Question 16

Which of the following is a key feature of constitutive heterochromatin?

Accepted Answer

Is highly repetitive and remains condensed throughout the cell cycle.

Question 17

Which of the following best describes the relationship between genome size and organismal complexity?

Accepted Answer

There is a loose relationship; some simple organisms have large genomes and vice versa.

Question 18

Which of the following is true about the human genome's repeat content?

Accepted Answer

More than half of the genome is repetitive DNA.

Question 19

Which of the following is a real-world application of variable number tandem repeats (VNTRs)?

Accepted Answer

DNA fingerprinting for forensic identification.

Question 20

Which of the following statements about LINEs and SINEs is correct?

Accepted Answer

LINEs and SINEs are types of transposable elements that are interspersed throughout the genome.

Introduction to Chromosomes, Genome Organization, and Repetitive DNA

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