Question 1

Which of the following best describes the main difference between the sugar components of DNA and RNA, as depicted in the first image?

Accepted Answer

DNA contains deoxyribose, which lacks an -OH group at the 2' carbon, while RNA contains ribose, which has an -OH group at the 2' carbon.

Question 2

In the central dogma of molecular biology, which process is responsible for synthesizing RNA from a DNA template, as shown in the second image?

Accepted Answer

Transcription

Question 3

Which enzyme is responsible for catalyzing the synthesis of mRNA from a DNA template during transcription?

Accepted Answer

RNA polymerase

Question 4

According to the central dogma, what is the correct order of information flow in a cell?

Accepted Answer

DNA → RNA → Protein

Question 5

Which of the following statements about the structure of nucleotides in DNA and RNA is correct?

Accepted Answer

DNA nucleotides contain deoxyribose and thymine, while RNA nucleotides contain ribose and uracil.

Question 6

Which process, depicted in the central dogma diagram, involves the synthesis of a polypeptide chain using mRNA as a template?

Accepted Answer

Translation

Question 7

What is the significance of the 5' and 3' ends in nucleic acids, as shown in the nucleotide structures?

Accepted Answer

They indicate the orientation of the sugar-phosphate backbone, which is essential for processes like replication and transcription.

Question 8

Which of the following best explains why RNA is generally less stable than DNA?

Accepted Answer

RNA contains a 2'-hydroxyl group, making it more susceptible to hydrolysis.

Question 9

During gene expression, which molecule acts as the template for translation?

Accepted Answer

mRNA

Question 10

Which of the following equations correctly represents the relationship between the number of possible nucleotide sequences of length $$n$$ and the number of nucleotide types ($$k$$)?

Accepted Answer

$$k^n$$

Question 11

If a mutation changes a cytosine to a thymine in DNA, what type of mutation is this?

Accepted Answer

Transition

Question 12

Which of the following is a real-world application of understanding the central dogma of molecular biology?

Accepted Answer

Designing drugs that inhibit DNA replication in bacteria

Question 13

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

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the mRNA codons.

Question 14

Which of the following is a correct representation of the base pairing in DNA?

Accepted Answer

Adenine pairs with thymine, guanine pairs with cytosine

Question 15

Which of the following best explains why the directionality of nucleic acids is important for biological processes?

Accepted Answer

It ensures that enzymes like DNA and RNA polymerases synthesize nucleic acids in the correct 5' to 3' direction.

Gene Expression and Regulation: Mechanisms, Measurement, and Modeling

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