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Molecular Basis of Inheritance

Multiple Choice Questions

141.

Which type of DNA is found in bacteria

Helical DNA
Membrane bound DNA
Straight DNA
Circular free DNA

142.

The chemical knifes of DNA are

polymerases
ligases
endonucleases
amylases

143.

Refer to the given figure and select the correct option regarding its parts labelled as A, B and C.

A-Histone octamer, C-DNA
B-H₁ histone, C-Histone octamer
A-H₁ histone, B-DNA
A-Histone octamer, C-H₁ histone

144.

Match the triplet codons listed in column I with their amino acids mentioned in column II and select the correct option from the given codes.
Column I Column II
A. GGG (i) Proline
B. UUU (ii) Glycine
C. CCC (iii) Arginine
D. AAA (iv) Phenylalanine
(v) Lysine

A-(v), B-(iii), C-(i), D-(ii)
A-(v), B-(iii), C-(i), D-(iv)
A-(ii), B-(iv), C-(i), D-(v)
A-(i), B-(ii), C-(iii),D-(iv)

145.

Radio-tracer technique shows that DNA is in

single-helix stage
double-helix stage
multi-helix stage
none of these

146.

Assertion: The honeybee queen copulates only once in her life time.

Reason: The honeybee queen can lay fertilised as well as unfertilised eggs.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

147.

In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases?

780
1560
740
1480

148.
Some of the steps of DNA fingerprinting are given below. Identify their correct sequence from the options given.
A. Electrophoresis of DNA fragments
B. Hybridisation with DNA probe
C. Digestion of DNA by restriction endonucleases
D. Autoradiography
E. Blotting of DNA fragmentsto nitrocellulose membrane

C - A - B - E - D

C - A - E - B - D

A - E - C - B - D

A - C - E - D - B

C - A - E - B - D

The technique of DNA fingerprinting involves following steps:

(i) Isolation of DNA from sample cell

(ii) Amplification of DNA using Polymerase Chain Reaction (PCR), (if DNA is less in amount).

(iii) Digestion of this DNA by restriction endonucleases (C)

(iv) These DNA fragments are electrophoresed in agarose gel. These fragments can be visualised using EtBr - UV system (A)

(v) Separated DNA fragments are transferred to nitrocellulose membrane using Southern Blotting (E).

(vi) Probing for VNTRs is done using labelled DNA probes (B).

(vii) The hybridised fragment can be detected by autoradiography (D).

149.

Which of the following set of options is used in translation

hnRNA, tRNA, rRNA
mRNA, tRNA, rRNA
mRNA, tRNA, hnRNA
hnRNA, rRNA, tRNA

150.

If the sequence of bases in the coding strand of a double stranded DNA is 5'-GTTCGAGTC-3', the sequence of bases in its transcript will be

5'-GACUCGAAC-3'
5'-CAAGCUCAG-3'
5'-GUUCGAGUC-3'
5'-CUGAGCUUG-3'