Structure of dsDNA Quiz | Structure of dsDNA Objective Type Questions & Answers

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Questions
21 short length of DNA molecule has 80 thymine and 80 guanine bases. The total number of nucleotide in the DNA fragment is
A 160
B 40
C 320
D 640

Answer: 320
22 Z-DNA have a
A Double helical nature
B Zig-Zag apperarance
C uracil base
D single stranded nature

Answer: Zig-Zag apperarance
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23 Left handed DNA
A A-DNA
B B-DNA
C Z-DNA
D C-DNA

Answer: Z-DNA
24 The length of DNA having 23 base pairs is
A 78 Ao
B 78.4 Ao
C 78.2 Ao
D 74.8 Ao

Answer: 74.8 Ao
25 The type of sugar in DNA are
A triose
B tetrose
C pentose
D hexose

Answer: pentose
26 The length of one turn of DNA is
A 3.4 A degree
B 34 A degree
C 20 A degree
D None of these

Answer: 34 A degree
27 Adjacent nucleotides are joined by
A covalent bond
B phosphodiester bond
C ionic bond
D peptide bond

Answer: phosphodiester bond
28 The basic repeating units of a DNA molecule is
A nucleoside
B nucleotide
C histones
D aminoacids

Answer: nucleotide
29 Chromatin is composed of
A nucleic acids and protein
B nucleic acids only
C proteins only
D none of these

Answer: nucleic acids and protein
30 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
31 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
32 DNA is present in
A nucleus only
B nucleus, mitochondria and ER
C nucleus, mitochondria and choloroplast
D nucleus, mitochondria and RER

Answer: nucleus, mitochondria and choloroplast
33 Genetic mutation occurs in
A Protein
B RNA
C DNA
D Nucleus

Answer: DNA

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