Question 1

Which of the following best describes the process of transcription in eukaryotic cells?

Accepted Answer

It converts a portion of double-stranded DNA to single-stranded mRNA within the nucleus.

Question 2

During translation, which molecule carries the anticodon that pairs with the codon on mRNA?

Accepted Answer

tRNA

Question 3

A mutation changes a single base in a gene, resulting in a different amino acid in the protein sequence. Which level of protein structure is directly affected first?

Accepted Answer

Primary structure

Question 4

Which of the following statements about introns and exons is correct?

Accepted Answer

Introns are removed from the RNA primary transcript, while exons remain and are joined to form mRNA.

Question 5

Given the mRNA codon sequence 5'-AUG-GGC-UAA-3', use the codon table to determine the resulting amino acid sequence.

Accepted Answer

Methionine-Glycine

Question 6

Which of the following best describes the role of rRNA during translation?

Accepted Answer

It forms the core of the ribosome and catalyzes the formation of peptide bonds between amino acids.

Question 7

A patient is diagnosed with sickle cell anemia, which is caused by a single amino acid substitution in hemoglobin. This is an example of how a change in which protein structure level can affect function?

Accepted Answer

Primary structure

Question 8

Which of the following is true about the secondary structure of proteins?

Accepted Answer

It is stabilized by hydrogen bonds and includes alpha helices and beta sheets.

Question 9

What is the correct sequence of events in protein synthesis?

Accepted Answer

Transcription → mRNA processing → Translation → Protein folding

Question 10

Which of the following codons signals the start of translation?

Accepted Answer

$$\mathrm{AUG}$$

Question 11

If a protein is composed of multiple polypeptide chains, which level of protein structure does this describe?

Accepted Answer

Quaternary structure

Question 12

Which of the following best explains why several codons can code for the same amino acid?

Accepted Answer

The genetic code is redundant.

Question 13

During translation, what happens when a stop codon is reached on the mRNA?

Accepted Answer

The ribosome releases the polypeptide chain and detaches from the mRNA.

Question 14

Which of the following is a function of ribozymes during mRNA processing?

Accepted Answer

They remove introns from the RNA primary transcript.

Question 15

A scientist mutates the gene for an rRNA molecule so that it cannot bind mRNA. What is the most likely result?

Accepted Answer

Translation will not initiate because the ribosome cannot assemble on the mRNA.

Question 16

Which of the following bonds are responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 17

A tRNA molecule has the anticodon $$\mathrm{UAC}. $$Which mRNA codon will it pair with, and which amino acid will it deliver?

Accepted Answer

AUG; Methionine

Question 18

Which of the following best describes the tertiary structure of a protein?

Accepted Answer

The overall three-dimensional shape formed by twists and folds of the polypeptide chain.

Question 19

Which enzyme is required for the synthesis of the RNA primary transcript during transcription?

Accepted Answer

RNA polymerase

Question 20

A mutation causes a protein to lose its quaternary structure but retain its tertiary structure. Which of the following is most likely true?

Accepted Answer

The protein is composed of multiple polypeptide chains that can no longer associate.

Protein Synthesis: From DNA to Functional Proteins

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