Molecular Basis of Inheritance Test

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Molecular Basis of Inheritance Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not transcribed by RNA polymerase III?

A
tRNA

B
5srRNA

C
hnRNA

D
snRNA

Solution

Heterogenous nuclear RNA or hnRNA is transcribed by RNA polymerase II. It is a precursor of mRNA.
Question 2
1 / -0

Which of the following pairs of amino acids is coded by the maximum number of codons?

A
Asparagine and aspartic acid

B
Methionine and tryptophan

C
Leucine and serine

D
Isoleucine and stop codons

Solution

Leucine and serine are coded by 6-6 codons, each. Leucine by CUU, CUC, CUA, CUG, UUA and UUG. Serine by UCU, UCC, UCA, UCG, AGU and AGC.
Question 3
1 / -0

In which of the following amino acids does mutation results in sickle cell anaemia?

A
Valine

B
Glutamic acid

C
Lysine

D
Aspartate

Solution

Point mutation creates a change of single base pair in gene for beta globin chain. It results in the change of one amino acid residue glutamic acid to valine.
Question 4
1 / -0

Which of the following arms of tRNA does not consist of a loop?

A
Anticodon arm

B
Acceptor arm

C
T-arm

D
D-arm

Solution

The acceptor arm of tRNA is without a loop as the ends are free to bind to amino acids.
Question 5
1 / -0

When an inducer is absent in Lac operon, then the repressor protein binds to

A
operator gene

B
promoter gene

C
structural genes

D
regulator gene

Solution

When an inducer is absent, the repressor protein binds to operator and prevents transcription of operon by RNA polymerase. The structural genes do not synthesise mRNA and protein synthesis is inhibited.
Question 6
1 / -0

The building block of nucleic acid is a

A
nitrogenous base

B
ribose sugar

C
phosphate group

D
nucleotide

Solution

A nucleotide is the structural component, or building block, of DNA and RNA. A nucleotide consists of a nitrogenous base, a molecule of sugar and phosphoric acid.
Question 7
1 / -0

Each strand of DNA has a typical structure. Which of the following statements correctly explains its structure?

A
The sugar-phosphate chain on the outside and the bases on the inside are held together by weak hydrogen bonds.

B
The sugar-phosphate chain on the inside and the bases on the outside are held together by weak hydrogen bonds.

C
The sugar-phosphate chain on the outside and the bases on the inside are held together by strong hydrogen bonds.

D
The sugar-phosphate chain on the inside and the bases on the outside are held together by strong hydrogen bonds.
Question 8
1 / -0

Which of the following base pairs in DNA are correct?

A
Adenine-Cytosine

B
Guanine-Cytosine

C
Adenine-Guanine

D
Guanine-Thymine

Solution

Yes, it is correct. A purine base always pairs with a pyrimidine base. Guanine pairs with cytosine.
Question 9
1 / -0

When live rough-type bacteria and heat killed S-type were injected together into mice, they died due to pneumonia. Which of the following explains this correctly?

A
Rough-type bacteria, when injected into mice, produce pneumonia.

B
Smooth-type bacteria, when injected into mice, produce pneumonia.

C
Some factors from the dead S-cells convert the live R-cells into S-cells and pneumonia is produced.

D
Some factors from the dead S-cells, when injected into mice, became live S-cells and produced pneumonia.
Question 10
1 / -0

In which of the following processes does copying of genetic information from one strand of DNA into RNA take place?

A
Replication

B
Transcription

C
Mutation

D
Translation

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Re-Attempt Weekly Quiz Competition

Molecular Basis of Inheritance Test - 2

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Molecular Basis of Inheritance Test - 2

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Question 1

tRNA

5srRNA

hnRNA

snRNA

Solution

Question 2

Asparagine and aspartic acid

Methionine and tryptophan

Leucine and serine

Isoleucine and stop codons

Solution

Question 3

Valine

Glutamic acid

Lysine

Aspartate

Solution

Question 4

Anticodon arm

Acceptor arm

T-arm

D-arm

Solution

Question 5

operator gene

promoter gene

structural genes

regulator gene

Solution

Question 6

nitrogenous base

ribose sugar

phosphate group

nucleotide

Solution

Question 7

The sugar-phosphate chain on the outside and the bases on the inside are held together by weak hydrogen bonds.

The sugar-phosphate chain on the inside and the bases on the outside are held together by weak hydrogen bonds.

The sugar-phosphate chain on the outside and the bases on the inside are held together by strong hydrogen bonds.

The sugar-phosphate chain on the inside and the bases on the outside are held together by strong hydrogen bonds.

Question 8

Adenine-Cytosine

Guanine-Cytosine

Adenine-Guanine

Guanine-Thymine

Solution

Question 9

Rough-type bacteria, when injected into mice, produce pneumonia.

Smooth-type bacteria, when injected into mice, produce pneumonia.

Some factors from the dead S-cells convert the live R-cells into S-cells and pneumonia is produced.

Some factors from the dead S-cells, when injected into mice, became live S-cells and produced pneumonia.

Question 10

Replication

Transcription

Mutation

Translation

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