Question 1

Which of the following best explains why eukaryotic gene expression is more complex than prokaryotic gene expression?

Accepted Answer

Eukaryotes have multiple levels of gene regulation, including chromatin remodeling, RNA processing, and post-translational control.

Question 2

What is the primary function of chromatin remodeling in eukaryotic cells?

Accepted Answer

To allow RNA polymerase access to DNA for transcription.

Question 3

DNA methylation typically occurs at which sequence, and what is its effect on gene expression?

Accepted Answer

At $$5'-CpG-3'$$ sequences, decreasing gene expression.

Question 4

Which enzyme is responsible for adding acetyl groups to histones, and what is the result of this modification?

Accepted Answer

Histone acetyltransferase (HAT); chromatin becomes decondensed and accessible for transcription.

Question 5

Which of the following best describes the role of enhancers in eukaryotic gene regulation?

Accepted Answer

Enhancers are DNA sequences that can be located far from the promoter and increase transcription when bound by activator proteins.

Question 6

A mutation causes the loss of function of a tumor suppressor gene. What is the most likely consequence?

Accepted Answer

Uncontrolled cell growth and increased risk of cancer.

Question 7

Which process allows a single gene to produce multiple different proteins in eukaryotes?

Accepted Answer

Alternative splicing of pre-mRNA.

Question 8

What is the effect of histone deacetylase (HDAC) activity on chromatin structure and gene expression?

Accepted Answer

HDAC removes acetyl groups, causing chromatin to condense and decrease gene expression.

Question 9

Which of the following is a real-world application of recombinant DNA technology?

Accepted Answer

Producing insulin in E. coli for diabetes treatment.

Question 10

Which of the following best describes epigenetics?

Accepted Answer

Heritable changes in gene expression not associated with changes in DNA sequence, such as DNA methylation and histone modification.

Question 11

A researcher moves an enhancer sequence from upstream to downstream of a gene. What is the expected effect on gene expression?

Accepted Answer

Gene expression will remain unchanged because enhancers function regardless of position or orientation.

Question 12

Which of the following is NOT a stage at which eukaryotic gene regulation can occur?

Accepted Answer

Protein folding in the cytoplasm.

Question 13

Which type of RNA is involved in blocking translation of specific mRNAs in eukaryotic cells?

Accepted Answer

miRNA

Question 14

What is the role of promoter-proximal elements in eukaryotic gene regulation?

Accepted Answer

They are unique DNA sequences close to the promoter that help regulate transcription of specific genes.

Question 15

Which of the following best describes the function of transcription factors?

Accepted Answer

Transcription factors are regulatory proteins that bind to DNA sequences such as enhancers, silencers, and promoter-proximal elements to activate or repress transcription.

Question 16

A scientist uses restriction endonucleases to cut a plasmid and insert a gene of interest. What is the next step to create a recombinant plasmid?

Accepted Answer

Use DNA ligase to seal the gene into the plasmid.

Question 17

Which of the following statements about transgenic organisms is correct?

Accepted Answer

Transgenic organisms are created by introducing genes from other species using recombinant DNA technology.

Question 18

Which of the following is a consequence of DNA methylation being inherited through cell division?

Accepted Answer

Patterns of gene expression can be passed from parent to offspring without changes in DNA sequence.

Question 19

Which of the following best explains why alternative splicing is important for multicellular eukaryotes?

Accepted Answer

It allows a single gene to produce different proteins for different cell types and functions.

Question 20

Which of the following is a key difference between gene regulation in prokaryotes and eukaryotes?

Accepted Answer

Eukaryotes regulate gene expression at multiple levels, including chromatin remodeling, RNA processing, and post-translational modification.

Gene Expression in Eukaryotes: Regulation and Mechanisms

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