Question 1

Which of the following best describes the function of the genetic code in translation?

Accepted Answer

It determines the sequence of amino acids in a protein based on the sequence of nucleotides in mRNA.

Question 2

Which RNA polymerase is responsible for transcribing mRNA in eukaryotic cells?

Accepted Answer

RNA polymerase II

Question 3

A mutation in the TATA box of a eukaryotic gene would most likely affect which process?

Accepted Answer

Initiation of transcription

Question 4

During translation, which site of the ribosome holds the tRNA carrying the next amino acid to be added to the polypeptide chain?

Accepted Answer

A (aminoacyl) site

Question 5

Which of the following equations correctly represents the process of transcription?

Accepted Answer

$$DNA \xrightarrow{RNA\,polymerase} mRNA$$

Question 6

Which of the following is a key difference between prokaryotic and eukaryotic transcription?

Accepted Answer

Eukaryotes use three different RNA polymerases, while prokaryotes use only one.

Question 7

Which of the following best describes the role of enhancers in gene expression?

Accepted Answer

They increase the rate of transcription by binding regulatory proteins.

Question 8

A scientist observes that a certain gene is only expressed in liver cells but not in skin cells. Which of the following best explains this observation?

Accepted Answer

Different regulatory transcription factors are present in liver and skin cells.

Question 9

Which of the following steps occurs first during the process of translation?

Accepted Answer

The small ribosomal subunit binds to the mRNA.

Question 10

Which of the following is the correct sequence of events in the HIV life cycle after entry into a host cell?

Accepted Answer

Reverse transcription, integration, transcription, translation, assembly

Question 11

Which of the following statements about the wobble position in tRNA is correct?

Accepted Answer

It allows some tRNAs to recognize more than one codon.

Question 12

Which of the following best describes the function of the Shine-Dalgarno sequence in prokaryotic translation?

Accepted Answer

It helps the ribosome recognize the start site on mRNA.

Question 13

Which of the following is a function of the 5' cap added to eukaryotic mRNA?

Accepted Answer

It protects mRNA from degradation and assists in ribosome binding.

Question 14

Which of the following equations represents the process of translation?

Accepted Answer

$$mRNA \xrightarrow{ribosome} Protein$$

Question 15

Which of the following is NOT a step in the regulation of gene expression at the transcriptional level?

Accepted Answer

Attachment of amino acids to tRNA

Question 16

Which of the following best explains why eukaryotic genes are often regulated at multiple levels?

Accepted Answer

To allow for precise control of gene expression in response to complex signals.

Question 17

Which of the following is a role of general transcription factors in eukaryotic transcription?

Accepted Answer

They help position RNA polymerase at the promoter.

Question 18

Which of the following is a function of the poly-A tail added to eukaryotic mRNA?

Accepted Answer

It increases mRNA stability and assists in export from the nucleus.

Question 19

Which of the following best describes the function of reverse transcriptase in the HIV life cycle?

Accepted Answer

It synthesizes DNA from an RNA template.

Question 20

Which of the following is a correct statement about the role of the aminoacyl-tRNA synthetase?

Accepted Answer

It attaches the correct amino acid to its corresponding tRNA.

Gene Expression, Regulation, and Viral-Host Interactions: Study Notes for Cell Biology

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