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WorksheetsDNA STRUCTURE XIIB
Total questions: 35
Worksheet time: 18mins
Name
Class
Date
1.
The DNA of a chromosome contains information which determine the structure and function of
a)
proteins
b)
fats
c)
carbohydrates
d)
starch
2.
Which of the following is a correct description of a chromosome?
a)
a chain of DNA bases
b)
a chain of RNA bases
c)
a chain of amino acids
d)
a chain of sugar molecules
3.
All proteins are composed of
a)
genes
b)
DNA
c)
amino acids
d)
bases
4.
A chromosome
a)
carries genetic information
b)
controls cell respiration
c)
is the site of photosynthesis
d)
speeds up chemical reactions
5.
A section of chromosome which carries a separate piece of genetic information is called a
a)
protein
b)
gene
c)
base
d)
nucleus
6.
The function of DNA is to
a)
act as an enzyme
b)
release energy in cells
c)
carry genetic instructions
d)
form cell structure
7.
An amino acid is a unit of the structure of
a)
protein
b)
DNA
c)
carbohydrate
d)
chromosome
8.
Proteins are chains of
a)
bases
b)
amino acids
c)
sugars
d)
genes
9.
DNA is not present in a
a)
nucleus
b)
gene
c)
chromosome
d)
membrane
10.
The sugar present in DNA is
a)
ribose
b)
glucose
c)
maltose
d)
deoxyribose
11.
Which of the following is a base pair normally found in DNA?
a)
A&C
b)
G&A
c)
A&T
d)
G&T
12.
A nucleoside is composed of
a)
a base +a sugar
b)
a base +a sugar+ a phosphate
c)
a base+ a phosphate
d)
none of these
13.
Genetic mutation occurs in
a)
protein
b)
RNA
c)
DNA
d)
Nucleus
14.
DNA is a genetic material
a)
virus, prokaryotes , eukaryotes
b)
prokaryotes, eukaryotes
c)
some virus,prokaryotes, eukaryotes
d)
only in eukaryotes
e)
s
15.
Two strands of a DNA double helix are joined by
a)
Hydrogen bond
b)
Covalent bond
c)
Van Wal force
d)
phospho diester bond
16.
Chromatin is composed of
a)
nucleic acids and proteins
b)
nucleic acid only
c)
proteins only
d)
none of these
17.
The basic repeating units of DNA are called
a)
Nucleotide
b)
nucleoside
c)
histones
d)
amino acid
18.
Adjacent nucleotides are joined by
a)
Hydrogen bond
b)
Covalent bond
c)
Van Wal force
d)
phospho diester bond
19.
Length of a DNA turn
a)
3.4amstrong
b)
34 amstrong
c)
20amstrong
d)
3.04amstrong
20.
The type of sugar present in DNA is
a)
Triose
b)
Tetrose
c)
Pentose
d)
Hexose
21.
The width of a DNA molecule is
a)
15amstrong
b)
3.4amstrong
c)
34amstrong
d)
20 amstrong
22.
The length of DNA having 23 base pairs is
a)
78 A
b)
78.2A
c)
78.4A
d)
78.8A
23.
Left handed DNA is called
a)
A-DNA
b)
B-DNA
c)
Z-DNA
d)
C-DNA
24.
A short lenth DNA molecule has T=80, G=80. What is the total number of nucleotides.
a)
160
b)
40
c)
320
d)
640
25.
What should be the complementary strand of 3’….ATGGCTTGA….5’?
a)
3’….TACCGAACT….5’
b)
b) 5’….TACCGAACT….3’
c)
c) 3’….TAGGCAAGT….5’
d)
d) 5’….TAGGCAAGT….3’
26.
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 force
27.
It is easy to break the bond between A and T than in between G and C
a)
true
b)
false
28.
The length of major groove is
a)
12A
b)
22A
c)
40A
d)
34A
29.
C-value is
a)
Total amount of DNA per genome
b)
Total DNA per organsim
30.
Circular DNA is notfound in
a)
E coli
b)
Mitochondria
c)
plastids
d)
amoeba
31.
Nucleic acids were first isolated by
a)
Kornberg
b)
Mischer
c)
Altman
d)
Mendel
32.
How many base pairs of DNA helix are contained in 10 nucleosomes?
a)
4000
b)
3000
c)
200
d)
300
33.
In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called
a)
A-DNA
b)
B-DNA
c)
cDNA
d)
Z-DNA
34.
If a double stranded DNA has 18% of cytosine, what will be the percentage of adenine in it ?
a)
18%
b)
32%
c)
48%
d)
64%
35.
Find out the number of base pairs in E. coli DNA,if its DNA is
1.36mm long
a)
4000000
b)
2000000
c)
3000000
d)
6000000
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