Question 1

Which of the following best describes the function of the promoter region in a eukaryotic gene?

Accepted Answer

It is the site where RNA polymerase binds to initiate transcription.

Question 2

Given the DNA sequence 5'-TATAAATGGTGCGCAAAGGGGGG-3', which region is most likely to be an intron?

Accepted Answer

GTGCGCAAAG

Question 3

What is the start codon for translation in eukaryotic genes?

Accepted Answer

ATG

Question 4

If a mutation changes the DNA sequence from ATG to ATA at the start codon, what is the most likely effect?

Accepted Answer

Translation will not initiate, and no protein will be produced.

Question 5

Which of the following best defines a frameshift mutation?

Accepted Answer

A mutation where one or more bases are added or removed, altering the reading frame.

Question 6

A DNA template strand has the sequence 3'-TACGGT-5'. What is the corresponding mRNA sequence?

Accepted Answer

5'-AUGCCA-3'

Question 7

Which of the following is NOT a possible effect of a mutation in a eukaryotic gene?

Accepted Answer

The mutation always results in a nonfunctional protein.

Question 8

Which sequence marks the end of transcription in the Gene Explorer simulation?

Accepted Answer

GGGGG

Question 9

What is the effect of a silent mutation?

Accepted Answer

It does not change the amino acid sequence.

Question 10

Which of the following best describes the process of mRNA splicing in eukaryotes?

Accepted Answer

Introns are removed and exons are joined together.

Question 11

A mutation changes the sequence GTGCG to GTGCA at the beginning of an intron. What is the most likely outcome?

Accepted Answer

The intron may not be recognized and could remain in the mature mRNA.

Question 12

Which of the following is a real-world application of bioinformatics?

Accepted Answer

Analyzing DNA sequences to identify genetic disorders.

Question 13

If a frameshift mutation occurs early in the coding region, what is the most likely effect on the protein?

Accepted Answer

The protein will be truncated or nonfunctional.

Question 14

Which of the following sequences is a stop codon in eukaryotic genes?

Accepted Answer

TGA

Question 15

A mutation changes the C/G base-pair at position 58 to a T/A base-pair. If this occurs within an exon, which type of mutation is most likely?

Accepted Answer

Missense mutation

Question 16

Which of the following best describes the role of the poly-A tail in eukaryotic mRNA?

Accepted Answer

It extends the lifespan of the mRNA.

Question 17

If the start codon is deleted from a gene, what is the most likely effect?

Accepted Answer

Translation will not initiate, and no protein will be produced.

Question 18

Which of the following is true about exons?

Accepted Answer

They are joined together to form mature mRNA.

Question 19

A mutation changes the A/T base-pair in position 51 to T/A base-pair. If this results in a stop codon, what type of mutation is this?

Accepted Answer

Nonsense mutation

Question 20

Which of the following best describes the direction in which DNA is transcribed?

Accepted Answer

From the 3' to 5' end of the template strand.

Eukaryotic Gene Expression and Mutations: Structure, Function, and Analysis

Study Guide - Practice Questions