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Free download in PDF Structure of dsDNA Objective Type Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(22)
Z-DNA have a
[A]
Double helical nature
[B]
Zig-Zag apperarance
[C]
uracil base
[D]
single stranded nature
Answer: Zig-Zag apperarance
(23)
Left handed DNA
[A]
A-DNA
[B]
B-DNA
[C]
Z-DNA
[D]
C-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
(25)
The type of sugar in DNA are
[A]
triose
[B]
tetrose
[C]
pentose
[D]
hexose
(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
(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
(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
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
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