DNA MCQs | DNA Short Questions(MCQs) & Answers

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Questions
41 In a DNA double helix the bases are held together by hydrogen bonds. These hydrogen bonds are _________
A Covalent bonds
B Non-covalent bonds
C Ionic bonds
D Van der Waals forces

Answer: Non-covalent bonds
42 In early 1950s high quality X-ray diffraction photographs of DNA suggesting the DNA being double helix and composed of two nucleotide strands. Who took those photographs?
A Rosalind Franklin
B William Asbury
C Francis H. Crick and James D. Watson
D Rosalind Franklin and Maurice Wilkins

Answer: Rosalind Franklin and Maurice Wilkins
43 Left handed DNA
A A-DNA
B B-DNA
C Z-DNA
D C-DNA

Answer: Z-DNA
44 The width of DNA molecule is
A 15 Ao
B 3.4 Ao
C 20 Ao
D 25 Ao

Answer: 20 Ao
45 The length of one turn of DNA is
A 3.4 Ao
B 34 Ao
C 20 Ao
D 3.04 Ao

Answer: 34 Ao
46 The basic repeating units of a DNA molecule is
A nucleoside
B nucleotide
C histones
D aminoacids

Answer: nucleotide
47 The two strands in a DNA double is joined by
A Co-valent bond
B Hydrogen bond
C ionic bond
D phosphodiester bond

Answer: Hydrogen bond
48 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

Answer: in some viruses, prokaryotes and eukaryotes
49 Genetic mutation occurs in
A Protein
B RNA
C DNA
D Nucleus

Answer: DNA
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