Question 1

Which of the following best describes the process of gene expression in eukaryotic cells?

Accepted Answer

Transcription of DNA into mRNA followed by translation of mRNA into protein.

Question 2

What is the correct order of information flow according to the central dogma of molecular biology?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 3

Which of the following is a pyrimidine found in DNA?

Accepted Answer

Cytosine

Question 4

A nucleotide consists of which three components?

Accepted Answer

Phosphate group, pentose sugar, nitrogenous base

Question 5

Which type of bond links nucleotides together in a nucleic acid polymer?

Accepted Answer

Phosphodiester bond

Question 6

What is the difference between the sugars in DNA and RNA?

Accepted Answer

DNA contains deoxyribose, which lacks an oxygen atom at the 2' carbon; RNA contains ribose, which has an oxygen at the 2' carbon.

Question 7

Which statement about the structure of DNA is correct?

Accepted Answer

DNA is a double helix with strands running in opposite directions (antiparallel).

Question 8

Which base pairs with adenine in DNA?

Accepted Answer

Thymine

Question 9

Why is complementary base pairing important for DNA replication?

Accepted Answer

It ensures accurate copying of genetic information.

Question 10

Which of the following is true about RNA compared to DNA?

Accepted Answer

RNA is usually single-stranded and can fold into complex shapes.

Question 11

A mutation changes a cytosine to a thymine in a DNA sequence. What type of mutation is this?

Accepted Answer

A transition mutation (pyrimidine to pyrimidine)

Question 12

If a DNA strand has the sequence 5'-ATCG-3', what is the complementary sequence?

Accepted Answer

3'-TAGC-5'

Question 13

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

Accepted Answer

DNA lacks a hydroxyl group at the 2' carbon, making it less susceptible to hydrolysis.

Question 14

Which process involves the synthesis of mRNA from a DNA template?

Accepted Answer

Transcription

Question 15

What is the function of nucleic acids in cells?

Accepted Answer

They store, transmit, and express genetic information.

Question 16

Which of the following is a purine base found in nucleic acids?

Accepted Answer

Guanine

Question 17

During translation, what is the role of mRNA?

Accepted Answer

It provides the template for assembling amino acids into a protein.

Question 18

Which end of a nucleotide polymer has a free phosphate group?

Accepted Answer

5' end

Question 19

Which of the following statements about complementary base pairing is correct?

Accepted Answer

It allows for accurate replication and transmission of genetic information.

Question 20

Which of the following is NOT a function of nucleic acids?

Accepted Answer

Catalyzing metabolic reactions

Nucleic Acids: Structure, Function, and Genetic Information

Study Guide - Practice Questions