Question 1

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

Accepted Answer

It is the DNA sequence where RNA polymerase binds to initiate transcription.

Question 2

Given the DNA template strand 3'-TACGGTACG-5', what is the corresponding mRNA sequence?

Accepted Answer

$$5'	ext{AUGCCAUGC}\ 3'$$

Question 3

Which of the following mutations is most likely to result in a truncated (shortened) protein?

Accepted Answer

Nonsense mutation

Question 4

A DNA sequence is mutated from 5'-ATG-3' to 5'-ATA-3'. What is the effect on translation?

Accepted Answer

Translation will start at a different location, possibly resulting in a nonfunctional protein.

Question 5

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

Accepted Answer

Introns are removed and exons are joined together.

Question 6

If a frameshift mutation occurs early in the coding region of a gene, what is the most likely outcome?

Accepted Answer

The protein will have a completely different amino acid sequence after the mutation site.

Question 7

Which sequence marks the beginning of an intron in the Gene Explorer simulation?

Accepted Answer

$$5'	ext{GTGCG}\ 3'$$

Question 8

What is the effect of a silent mutation on the polypeptide chain?

Accepted Answer

It does not change the amino acid sequence.

Question 9

Which of the following is NOT a reason why most mutations are considered silent?

Accepted Answer

The mutation changes the shape of the protein.

Question 10

A mutation changes the DNA sequence from 5'-TAA-3' to 5'-CAA-3'. What is the effect on translation?

Accepted Answer

A stop codon is lost, possibly resulting in a longer protein.

Question 11

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

Accepted Answer

It increases the stability and lifespan of the mRNA.

Question 12

If the terminator sequence is deleted from a gene, what is the most likely effect?

Accepted Answer

Transcription will continue beyond the normal endpoint.

Question 13

Which of the following is the correct definition of translation?

Accepted Answer

The process of synthesizing a polypeptide from mRNA.

Question 14

A base substitution mutation changes an AT base pair to a GC base pair. Which type of mutation is this?

Accepted Answer

Point mutation

Question 15

Which of the following sequences is a stop codon?

Accepted Answer

$$5'	ext{TAA}\ 3'$$

Question 16

A mutation occurs in the intron region of a gene. What is the most likely effect on the protein?

Accepted Answer

The protein will be unchanged.

Question 17

Which of the following best describes the relationship between exons and protein coding?

Accepted Answer

Exons contain the sequences that code for proteins.

Question 18

If a mutation changes the location of the start codon, what is the most likely effect?

Accepted Answer

Translation will begin at a new site, possibly producing a different protein.

Question 19

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

Accepted Answer

Analyzing DNA and protein sequences to identify genetic disorders.

Question 20

A mutation deletes a single base in the coding region of a gene. What is the most likely effect?

Accepted Answer

A frameshift mutation occurs, altering the reading frame and the amino acid sequence.

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

Study Guide - Practice Questions