Question 1

Which of the following best describes the role of RNA polymerase during transcription in eukaryotic cells?

Accepted Answer

It unwinds the DNA double helix and synthesizes a complementary RNA strand from the DNA template.

Question 2

During mRNA processing in eukaryotes, which of the following is removed from the primary RNA transcript?

Accepted Answer

Introns

Question 3

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

Accepted Answer

Primary structure

Question 4

Which of the following statements about codons is correct?

Accepted Answer

Each codon consists of three nucleotides and codes for one amino acid.

Question 5

What is the function of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome based on the codon sequence of mRNA.

Question 6

Which of the following best describes the process of translation initiation?

Accepted Answer

The small ribosomal subunit binds to mRNA and scans for the start codon, then the large subunit joins to form the complete ribosome.

Question 7

A patient has a genetic disorder caused by a single amino acid substitution in hemoglobin. This is most likely due to a mutation affecting which process?

Accepted Answer

The sequence of nucleotides in the DNA coding region for hemoglobin.

Question 8

Which of the following codons signals the start of translation?

Accepted Answer

$$AUG$$

Question 9

If the mRNA sequence is $$5'	ext{-}AUG\,GGC\,UAA	ext{-}3'$$, what is the corresponding amino acid sequence?

Accepted Answer

Methionine-Glycine

Question 10

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

Accepted Answer

The genetic code is redundant, meaning more than one codon can specify the same amino acid.

Question 11

Which of the following is NOT a function of ribosomal RNA (rRNA)?

Accepted Answer

Carrying amino acids to the ribosome.

Question 12

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

Accepted Answer

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

Question 13

Which of the following events occurs during the termination stage of translation?

Accepted Answer

The ribosome reaches a stop codon and releases the newly synthesized polypeptide.

Question 14

Which of the following is true regarding the quaternary structure of a protein?

Accepted Answer

It involves the association of multiple polypeptide chains.

Question 15

A scientist isolates a molecule with the sequence $$5'	ext{-}AUG\,GCU\,GGA\,UAA	ext{-}3'. $$Using the codon table, what is the resulting amino acid sequence?

Accepted Answer

Methionine-Alanine-Glycine

Question 16

Which of the following best explains why a change in the primary structure of a protein can lead to a nonfunctional protein?

Accepted Answer

The sequence of amino acids determines all higher levels of protein structure and function.

Question 17

Which of the following is a real-life example of the importance of correct protein synthesis?

Accepted Answer

Sickle cell anemia results from a single amino acid substitution in hemoglobin.

Question 18

Which of the following statements about exons is correct?

Accepted Answer

Exons are the coding regions of a gene that remain in mRNA after introns are removed.

Question 19

Which of the following best describes the flow of genetic information in eukaryotic cells?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 20

Which of the following is a function of the rough endoplasmic reticulum (ER) in protein synthesis?

Accepted Answer

It processes and packages newly synthesized proteins for transport.

Protein Synthesis: Transcription, Translation, and Protein Structure

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