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 the editing of the RNA primary transcript, which of the following statements is TRUE?

Accepted Answer

Introns are removed and exons are joined together to form functional mRNA.

Question 3

Which of the following codons serves as the start codon for translation in eukaryotic cells?

Accepted Answer

$$AUG$$

Question 4

A mutation changes a codon from $$GAA to$$ $$GUA in an $$mRNA sequence. Using the codon table, what is the consequence of this mutation?

Accepted Answer

The amino acid changes from Glutamic acid (Glu) to Valine (Val).

Question 5

Which of the following best describes the function of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome by matching its anticodon to the mRNA codon.

Question 6

Which of the following is a correct sequence of events during protein synthesis?

Accepted Answer

Transcription → RNA editing → Translation → Protein folding

Question 7

A patient has a mutation that prevents the formation of disulfide bonds in proteins. Which level of protein structure would be most directly affected?

Accepted Answer

Tertiary structure

Question 8

Which of the following statements about the genetic code is correct?

Accepted Answer

It is redundant, meaning multiple codons can code for the same amino acid.

Question 9

If a protein is composed of more than one polypeptide chain, which level of protein structure does this describe?

Accepted Answer

Quaternary structure

Question 10

Which of the following best explains why a single gene can code for multiple different proteins?

Accepted Answer

Alternative splicing of exons during RNA editing allows for different mRNA molecules to be produced from the same gene.

Question 11

During translation, what is the role of the ribosome?

Accepted Answer

It provides a site for mRNA and tRNA to interact and catalyzes the formation of peptide bonds.

Question 12

A mutation causes a stop codon to appear prematurely in an mRNA sequence. What is the most likely result?

Accepted Answer

A truncated, nonfunctional protein is produced.

Question 13

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

Accepted Answer

Hydrogen bonds

Question 14

Which process occurs in the cytoplasm and involves the conversion of mRNA code into a polypeptide chain?

Accepted Answer

Translation

Question 15

If the mRNA sequence is $$5'-AUG GGC UUU UGA-3'$$, what is the resulting amino acid sequence?

Accepted Answer

Met-Gly-Phe

Question 16

Which of the following is NOT a function of rRNA?

Accepted Answer

Carrying amino acids to the ribosome

Question 17

A single amino acid substitution in the primary structure of hemoglobin leads to sickle cell anemia. This is an example of how:

Accepted Answer

A change in primary structure can drastically alter protein function.

Question 18

Which of the following statements about exons is correct?

Accepted Answer

Exons are the coding regions that remain in mRNA after RNA editing.

Question 19

Which of the following best describes the relationship between DNA, mRNA, and protein?

Accepted Answer

DNA is transcribed into mRNA, which is then translated into protein.

Question 20

Which of the following is a real-life consequence of a mutation in the primary structure of a protein?

Accepted Answer

Sickle cell anemia caused by a single amino acid substitution in hemoglobin.

Protein Synthesis: Transcription, Translation, and Protein Structure

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