Question 1

Which of the following best describes the role of ribosomal RNA (rRNA) during translation?

Accepted Answer

rRNA catalyzes the formation of peptide bonds between amino acids.

Question 2

A mutation changes a codon from UAA to UAC. What type of mutation is this, and what is its likely effect?

Accepted Answer

It is a missense mutation, likely resulting in a different amino acid being incorporated.

Question 3

Which of the following statements about the wobble hypothesis is correct?

Accepted Answer

It allows flexibility in base pairing between the third base of a codon and the corresponding base in tRNA.

Question 4

During translation, which site on the ribosome is responsible for holding the tRNA carrying the growing polypeptide chain?

Accepted Answer

P site

Question 5

A cell is exposed to a mutagen that causes the insertion of a single nucleotide into a coding region. What is the most likely consequence?

Accepted Answer

A frameshift mutation, altering all downstream amino acids.

Question 6

Which of the following best explains why the ribosome is considered a ribozyme?

Accepted Answer

It catalyzes peptide bond formation using its RNA component.

Question 7

A charged tRNA is defined as:

Accepted Answer

A tRNA that is bound to its specific amino acid.

Question 8

Which of the following is the correct sequence of events during the initiation of translation in eukaryotes?

Accepted Answer

Small ribosomal subunit binds to mRNA, initiator tRNA binds, then large subunit joins.

Question 9

If a stop codon is mutated to code for an amino acid, what is the most likely result?

Accepted Answer

Translation will continue beyond the normal stop site, producing a longer protein.

Question 10

Which enzyme is responsible for attaching the correct amino acid to its corresponding tRNA?

Accepted Answer

Aminoacyl-tRNA synthetase

Question 11

A mutation changes the third base of a codon but does not alter the amino acid specified. What is this type of mutation called?

Accepted Answer

Silent mutation

Question 12

Which of the following best describes the function of messenger RNA (mRNA) in translation?

Accepted Answer

mRNA carries genetic information from DNA to ribosomes.

Question 13

A patient has a genetic disorder caused by a duplication of a segment of DNA. Which of the following is a likely consequence?

Accepted Answer

Production of a protein with repeated domains, possibly affecting function.

Question 14

Which of the following codons is a start codon in eukaryotic translation?

Accepted Answer

$\mathrm{AUG}$

Question 15

What is the main function of elongation factors during translation?

Accepted Answer

They facilitate the movement of tRNA and mRNA through the ribosome.

Question 16

Which of the following best describes a frameshift mutation?

Accepted Answer

A mutation that inserts or deletes nucleotides not in multiples of three, altering the reading frame.

Question 17

During translation, what is the role of the E site on the ribosome?

Accepted Answer

It is the site where the uncharged tRNA exits the ribosome.

Question 18

Which of the following statements about aminoacyl-tRNA synthetases is true?

Accepted Answer

Each synthetase is specific for one amino acid and its corresponding tRNA.

Question 19

A mutation in the gene encoding a ribosomal protein prevents the assembly of the large ribosomal subunit. What is the most likely effect on translation?

Accepted Answer

Initiation of translation will be blocked.

Question 20

Which of the following best explains the degeneracy of the genetic code?

Accepted Answer

Multiple codons can code for the same amino acid.

Translation: The Genetic Code and Protein Synthesis

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