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DNA MCQs | DNA Short Questions(MCQs) & Answers

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Free download in PDF DNA Short Questions & Answers for competitive exams. These objective type questions are very important for competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
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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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