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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.
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
44
The width of DNA molecule is
[A]
15 Ao
[B]
3.4 Ao
[C]
20 Ao
[D]
25 Ao
45
The length of one turn of DNA is
[A]
3.4 Ao
[B]
34 Ao
[C]
20 Ao
[D]
3.04 Ao
46
The basic repeating units of a DNA molecule is
[A]
nucleoside
[B]
nucleotide
[C]
histones
[D]
aminoacids
47
The two strands in a DNA double is joined by
[A]
Co-valent bond
[B]
Hydrogen bond
[C]
ionic bond
[D]
phosphodiester 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
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