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 is complementary to the codon on mRNA?

Accepted Answer

tRNA

Question 3

A mutation changes the DNA sequence from GAA to GUA. Using the codon table, what effect does this have on the resulting protein?

Accepted Answer

The amino acid changes from Glutamic acid (Glu) to Valine (Val), potentially altering protein function.

Question 4

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

Accepted Answer

Carrying amino acids to the ribosome

Question 5

What is the significance of the start codon AUG in translation?

Accepted Answer

It signals the beginning of translation and codes for Methionine.

Question 6

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

Accepted Answer

The specific sequence of amino acids held together by peptide bonds.

Question 7

A patient has a mutation that prevents the removal of introns from the RNA primary transcript. What is the most likely consequence?

Accepted Answer

The resulting mRNA will contain non-coding sequences, leading to a dysfunctional protein.

Question 8

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

Accepted Answer

The genetic code is redundant, allowing for multiple codons to specify the same amino acid.

Question 9

Which stage of translation involves the ribosome moving along the mRNA and the growing polypeptide chain elongating?

Accepted Answer

Elongation

Question 10

A protein is found to have multiple polypeptide chains. Which level of protein structure does this describe?

Accepted Answer

Quaternary structure

Question 11

Which of the following is true regarding the role of RNA polymerase in transcription?

Accepted Answer

It synthesizes a complementary RNA strand from a DNA template.

Question 12

If a mutation introduces a premature stop codon (UAG) in the middle of an mRNA sequence, what is the likely outcome?

Accepted Answer

Translation will terminate early, resulting in a truncated and likely nonfunctional protein.

Question 13

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

Accepted Answer

The formation of alpha-helices and beta-sheets stabilized by hydrogen bonds.

Question 14

Which process occurs in the cytoplasm and involves converting the mRNA code into a protein?

Accepted Answer

Translation

Question 15

A scientist isolates a molecule with the sequence 5'-AUGGCCUAA-3'. Using the codon table, what is the resulting amino acid sequence?

Accepted Answer

Methionine-Alanine-Stop

Question 16

Which of the following is a function of tRNA during translation?

Accepted Answer

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

Question 17

Which of the following changes in protein structure is most likely to result in a disease such as sickle cell anemia?

Accepted Answer

A single amino acid substitution in the primary structure.

Question 18

Which of the following statements about exons is correct?

Accepted Answer

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

Question 19

Which of the following best explains why changes in the tertiary structure of a protein can affect its function?

Accepted Answer

The 3D shape determines the protein's ability to interact with other molecules.

Question 20

Which enzyme is responsible for synthesizing the RNA primary transcript during transcription?

Accepted Answer

RNA polymerase

Protein Synthesis: From Genes to Functional Proteins

Study Guide - Practice Questions