Question 1

Which of the following best describes differential gene expression in eukaryotic cells?

Accepted Answer

Different cell types express different sets of genes, leading to cell specialization.

Question 2

Which process allows a single gene to produce multiple protein products in eukaryotes?

Accepted Answer

Alternative RNA splicing

Question 3

A researcher finds that a gene is highly methylated in liver cells but not in skin cells. What is the most likely effect of this methylation?

Accepted Answer

The gene will be silenced in liver cells due to methylation.

Question 4

Which of the following is a key difference between epigenetic inheritance and DNA mutations?

Accepted Answer

Epigenetic inheritance involves changes in gene expression without altering the DNA sequence.

Question 5

Which equation correctly represents the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 6

What is the role of general transcription factors in eukaryotic transcription?

Accepted Answer

They are required for the assembly of the transcription initiation complex at the promoter.

Question 7

A mutation causes the loss of function of a repressor protein in a cell. What is the most likely consequence?

Accepted Answer

The target gene will be expressed at higher levels due to lack of repression.

Question 8

Which of the following best describes the function of microRNAs (miRNAs) in gene regulation?

Accepted Answer

miRNAs bind to mRNA and inhibit translation or promote degradation.

Question 9

Which chromatin modification is most likely to increase gene expression?

Accepted Answer

Histone acetylation

Question 10

A scientist is studying a gene with the following regulatory elements: enhancer, promoter, exons, and introns. Which element is most directly involved in the initiation of transcription?

Accepted Answer

Promoter

Question 11

Which of the following statements about RNA interference (RNAi) is correct?

Accepted Answer

RNAi involves small RNAs that bind to mRNA and lead to its degradation or translational inhibition.

Question 12

Which of the following is NOT a post-transcriptional regulatory mechanism?

Accepted Answer

Histone acetylation

Question 13

If a gene's promoter region is mutated so that transcription factors cannot bind, what is the most likely outcome?

Accepted Answer

The gene will not be transcribed.

Question 14

Which of the following best explains why regulation of gene expression is important in multicellular organisms?

Accepted Answer

It enables cells to specialize and perform different functions.

Question 15

Which of the following is a function of enhancers in eukaryotic gene regulation?

Accepted Answer

They increase the rate of transcription by binding activator proteins.

Question 16

Which of the following is true regarding the degradation of mRNA?

Accepted Answer

It decreases gene expression by reducing the availability of mRNA for translation.

Question 17

Which of the following is a non-coding RNA involved in gene regulation?

Accepted Answer

miRNA

Question 18

A cell needs to turn off the expression of a gene. Which of the following mechanisms could achieve this?

Accepted Answer

Binding of a repressor protein to the operator region

Question 19

Which of the following factors is required for the initiation of transcription by RNA polymerase II in eukaryotes?

Accepted Answer

General transcription factors

Question 20

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

Accepted Answer

Histone acetylation loosens chromatin, increasing gene expression.

Regulation of Genetic Information in Living Systems: Flow, Expression, and Epigenetic Control

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