Question 1

During meiosis, crossovers between homologous chromosomes most frequently occur at which of the following locations?

Accepted Answer

At random locations along the entire chromosome, but with higher frequency in regions called recombination hotspots.

Question 2

If two genes are located 10 map units apart on the same chromosome, what is the expected recombination frequency between them?

Accepted Answer

$$0.10$$

Question 3

A geneticist performs a three-point test cross and observes the following recombination frequencies: gene A to B = 5%, gene B to C = 15%, gene A to C = 20%. What is the most likely gene order?

Accepted Answer

A - B - C

Question 4

Which experiment provided the strongest evidence that DNA, and not protein, is the genetic material?

Accepted Answer

Hershey and Chase's experiment using bacteriophages labeled with $$^{32}P$$ and $$^{35}S$$

Question 5

Which of the following statements best describes the difference between prokaryotic and eukaryotic DNA replication?

Accepted Answer

Eukaryotic chromosomes have multiple origins of replication, while prokaryotic chromosomes typically have a single origin.

Question 6

Which enzyme is responsible for removing RNA primers during DNA replication in prokaryotes?

Accepted Answer

DNA polymerase I

Question 7

Which of the following modifications is added to eukaryotic pre-mRNA to protect it from degradation and assist in ribosome binding?

Accepted Answer

5' cap

Question 8

In prokaryotic transcription, what is the role of the sigma ($$\sigma) $$factor?

Accepted Answer

It enables RNA polymerase to recognize and bind to the promoter region.

Question 9

Which of the following best describes the difference between the template and coding strands during transcription?

Accepted Answer

The template strand is used by RNA polymerase to synthesize RNA, while the coding strand has the same sequence as the RNA (except T is replaced by U).

Question 10

Which of the following is NOT a function of the ribosome during translation?

Accepted Answer

Adding a 5' cap to mRNA

Question 11

A tRNA molecule is considered 'charged' when:

Accepted Answer

It is covalently attached to its specific amino acid.

Question 12

Which of the following statements about the genetic code is correct?

Accepted Answer

It is degenerate, meaning that multiple codons can specify the same amino acid.

Question 13

In eukaryotes, which process occurs in the nucleus and involves the removal of introns from pre-mRNA?

Accepted Answer

Splicing

Question 14

Which of the following best explains why transcription and translation can occur simultaneously in prokaryotes but not in eukaryotes?

Accepted Answer

Prokaryotes lack a nuclear envelope, so ribosomes can access mRNA as it is being transcribed.

Question 15

A mutation in the gene encoding aminoacyl-tRNA synthetase would most likely result in which of the following?

Accepted Answer

Incorrect attachment of amino acids to tRNAs, leading to errors in protein synthesis.

Question 16

Which of the following post-translational modifications is most likely to target a protein for degradation?

Accepted Answer

Ubiquitination

Question 17

A patient is found to have a mutation that prevents the addition of a poly-A tail to mRNA. Which of the following is the most likely consequence?

Accepted Answer

The mRNA will be rapidly degraded in the cytoplasm.

Question 18

Which of the following best describes the function of the E site in the ribosome during translation?

Accepted Answer

It is the site where uncharged tRNAs exit the ribosome.

Question 19

A researcher is mapping three genes (X, Y, Z) and finds the following recombination frequencies: X-Y = 8%, Y-Z = 12%, X-Z = 20%. Which gene is in the middle?

Accepted Answer

Y

Question 20

Which of the following statements about the structure of nucleotides is correct?

Accepted Answer

A nucleotide consists of a phosphate group, a five-carbon sugar, and a nitrogenous base.

Genetics Exam 2 Study Guide: Genetic Linkage, DNA Replication, Transcription, and Translation

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