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DNA Multiple Choice Questions and Answers

DNA Multiple Choice Questions and Answers can help students evaluate their knowledge on DNA structure and functions. Answers are also given for DNA multiple choice questions and answers to help you remember. Try our DNA multiple choice questions and answers to see if you can get all the answers right for the questions below.

DNA Multiple Choice Questions and Answers

DNA is a molecule that carries and transmits hereditary characteristics or genetic instructions from parents to offspring. 

DNA Multiple Choice Questions and Answers

1. A nucleoside is composed of

a) A base+ a sugar

b) A base+ a sugar+ phosphate

c) A base+ a phosphate

d) None of these

2. Genetic mutation occurs in

a) Protein

b) RNA

c) DNA

d) Nucleus

3. DNA is present in

a) Nucleus only

b) Nucleus, mitochondria and ER

c) Nucleus, mitochondria and chloroplast

d) Nucleus, mitochondria and RER

4. DNA is the genetic material in

a) Viruses, prokaryote and eukaryote

b) Prokaryote and eukaryote

c) Only in eukaryotes

d) In some viruses, prokaryotes and eukaryotes

5. The two strands in a DNA double is joined by

a) Co-valent bond

b) Hydrogen bond

c) Ionic bond

d) Phosphodiester bond

6. Chromatin is composed of

a) Nucleic acids and protein

b) Nucleic acids only

c) Proteins only

d) None of these

7. The basic repeating units of a DNA molecule is

a) Nucleoside

b) Nucleotide

c) Histones

d) Amino acids

8. Adjacent nucleotides are joined by

a) Covalent bond

b) Phosphodiester bond

c) Ionic bond

d) Peptide bond

9. The length of one turn of DNA is

a) 3.4 Ao

b) 34 Ao

c) 20 Ao

d) 3.04 Ao

10. The type of sugar in DNA is

a) Triose

b) Tetrose

c) Pentose

d) Hexose

11. The width of DNA molecule is

a) 15 Ao

b) 3.4 Ao

c) 20 Ao

d) 25 Ao

12. The length of DNA having 23 base pairs is

a) 78 Ao

b) 78.4 Ao

c) 78.2 Ao

d) 74.8 Ao

13. Left handed DNA

a) A-DNA

b) B-DNA

c) Z-DNA

d) C-DNA

14. Z-DNA have a

a) Double helical nature

b) Zig-Zag apperarance

c) Uracil base

d) Single stranded nature

15. The process of DNA replication is affected by an enzyme known as

(a) Mutase

(b) Ligase

(c) Polymerase I

(d) Ribonuclease

Answers

  1. A base+ a sugar
  2. DNA
  3. Nucleus, mitochondria and chloroplast
  4. In some viruses, prokaryotes and eukaryotes
  5. Hydrogen bond
  6. Nucleic acids and protein
  7. Nucleotide
  8. Phosphodiester bond
  9. 34 Ao
  10.  Pentose
  11. 20 Ao
  12. 74.8 Ao
  13. Z-DNA
  14. Zig-Zag apperarance
  15. Polymerase I

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