Q: If a DNA template strand has the sequence $$3'\text{-}TACGGTACC\text{-}5'$$, what is the corresponding mRNA sequence produced during transcription?

$$5'\text{-}AUGCCAUGG\text{-}3'$$

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

Accepted Answer

tRNA

Question 3

A mutation changes the DNA sequence from CTT to CAT. Using the codon table, what is the effect on the amino acid sequence if the mRNA codon changes from GAA to GUA?

Accepted Answer

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

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 functional mRNA.

Question 5

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 6

What is the function of rRNA during translation?

Accepted Answer

It forms the core of the ribosome and catalyzes peptide bond formation.

Question 7

Which of the following codons signals the start of translation?

Accepted Answer

$$AUG$$

Question 8

A patient has a mutation that causes a single amino acid substitution in hemoglobin, resulting in sickle cell anemia. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 9

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 10

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

Accepted Answer

tRNA brings amino acids to the ribosome, and peptide bonds form between amino acids.

Question 11

If a DNA template strand has the sequence $$3'	ext{-}TACGGTACC	ext{-}5'$$, what is the corresponding mRNA sequence produced during transcription?

Accepted Answer

$$5'	ext{-}AUGCCAUGG	ext{-}3'$$

Question 12

Which of the following is a direct result of the termination stage of translation?

Accepted Answer

The polypeptide chain is released from the ribosome.

Question 13

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

Accepted Answer

The association of multiple polypeptide chains to form a functional protein.

Question 14

Which of the following statements about gene expression is correct?

Accepted Answer

Gene expression occurs when a gene is transcribed and translated to produce a protein.

Question 15

A scientist isolates a strand of mRNA with the sequence $$5'	ext{-}AUGGCCUAA	ext{-}3'. $$Using the codon table, what is the resulting amino acid sequence?

Accepted Answer

Met-Ala-Stop

Question 16

Which of the following is NOT a function of tRNA during translation?

Accepted Answer

Catalyzing the formation of peptide bonds between amino acids.

Question 17

Which of the following best explains why changes in the primary structure of a protein can have drastic effects on its function?

Accepted Answer

The sequence of amino acids determines how the protein folds and its final shape, which is critical for function.

Question 18

Which of the following processes occurs in the nucleus of a eukaryotic cell?

Accepted Answer

Transcription

Question 19

Which of the following is true regarding the redundancy of the genetic code?

Accepted Answer

Multiple codons can code for the same amino acid, reducing the impact of some mutations.

Question 20

Which of the following best describes the role of the rough endoplasmic reticulum (ER) in protein synthesis?

Accepted Answer

It processes, folds, and modifies newly synthesized proteins after translation.

Protein Synthesis: Transcription, Translation, and Protein Structure

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