Welcome to our DNA MCQ! DNA, or deoxyribonucleic acid, is a complex molecule containing the genetic information necessary for the creation and function of all living species. DNA structure, function, and replication are fundamental concepts for students of biology, genetics, and related subjects. This DNA MCQ blog has a series of MCQs about DNA to test your knowledge and help you gain a deeper understanding of this fundamental molecule. Each question contains a list of potential responses; thus, take your time, read carefully, and select the best option. Let’s get started!
DNA MCQ with Answers
1. Which of the following bases is not found in DNA?
a) Adenine
b) Cytosine
c) Thymine
d) Uracil
2. DNA stands for:
a) Deoxyribonucleic acid
b) Ribonucleic acid
c) Deoxyribonucleoside
d) Ribonucleoside
3. The structure of DNA was discovered by:
a) James Watson and Francis Crick
b) Rosalind Franklin
c) Maurice Wilkins
d) All of the above
4. Which of the following is the correct base pairing in DNA?
a) Adenine-Guanine; Thymine-Cytosine
b) Adenine-Cytosine; Thymine-Guanine
c) Adenine-Thymine; Cytosine-Guanine
d) Adenine-Uracil; Thymine-Cytosine
5. DNA is made up of:
a) Nucleotides
b) Amino acids
c) Fatty acids
d) Sugars
6. The backbone of DNA is made up of:
a) Phosphate groups and sugars
b) Amino acids and sugars
c) Fatty acids and glycerol
d) Nucleotides and nitrogenous bases
7. DNA replication occurs during:
a) Interphase of the cell cycle
b) Mitosis
c) Meiosis
d) Both b and c
8. Which enzyme unwinds the double helix during DNA replication?
a) Helicase
b) Polymerase
c) Ligase
d) Topoisomerase
9. During DNA replication, which enzyme adds nucleotides?
a) Helicase
b) Polymerase
c) Ligase
d) Topoisomerase
10. DNA is transcribed into:
a) mRNA
b) tRNA
c) rRNA
d) All of the above
11. The genetic code is read in:
a) Codons
b) Anticodons
c) Introns
d) Exons
12. Which of the following is not a type of mutation?
a) Substitution
b) Insertion
c) Deletion
d) Translation
13. The process of DNA sequencing involves:
a) Cutting the DNA into smaller fragments
b) Sequencing the smaller fragments
c) Assembling the fragments to form the full DNA sequence
d) All of the above
14. In PCR (polymerase chain reaction), which of the following is not a step?
a) Denaturation
b) Annealing
c) Elongation
d) Translation
15. DNA fingerprinting is based on:
a) Differences in the DNA sequence between individuals
b) Differences in the length of DNA fragments between individuals
c) Differences in the number of chromosomes between individuals
d) Differences in the shape of the DNA molecule between individuals
Answers
1. d) Uracil
2. a) Deoxyribonucleic acid
3. d) All of the above
4. c) Adenine-Thymine; Cytosine-Guanine
5. a) Nucleotides
6. a) Phosphate groups and sugars
7. a) Interphase of the cell cycle
8. a) Helicase
9. b) Polymerase
10. a) mRNA
11. a) Codons
12. d) Translation
13. d) All of the above
14. d) Translation
15. b) Differences in the length of DNA