Molecular Basis of Inheritance Test

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Molecular Basis of Inheritance Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:

A
A-DNA

B
B-DNA

C
c DNA

D
r DNA

Solution

Complementary DNA (cDNA) is double-stranded DNA synthesized from a messenger RNA (mRNA) template in a reaction catalysed by the enzyme reverse transcriptase.
Question 2
1 / -0

If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is :

5' - A T G A A T G - 3',

the sequence of bases in its RNA transcript would be;

A
5' - A U G A A U G - 3'

B
5' - U A C U U A C - 3

C
5' - C A U U C A U - 3'

D
5' - G U A A G U A - 3'

Solution

5' - A T G A A T G - 3' (coding strand)

5'- T A C T T A C - 3' (complementary)

5' -A U G A A U G - 3' (RNA)
Question 3
1 / -0

The RNA polymerase holoenzyme transcribes:

A
The promoter, structural gene and the terminator region

B
The promoter and the terminator region

C
The structural gene and the terminator region

D
The structural gene only.

Solution

Transcription involves three separate process : initiation, elongation and termination. Initiation begins when the RNA polymerase binds to the promoter which serves only as a target site for binding of the RNA polymerase and is not transcribed. Each gene contains a specic promoter region for guiding the beginning of transcription. This is followed by region of gene (structural gene) that is transcribed and ends with a terminator that stops transcription.
Question 4
1 / -0

If the base sequence of a codon in mRNA is 5'-AUG-3', the sequence of tRNA pairing with it must be:

A
5' - UAC - 3'

B
5' - CAU - 3'

C
5' - AUG - 3'

D
5' - GUA - 3'

Solution

The sequence of tRNA pairing with it must be 5' - CAU - 3'
Question 5
1 / -0

The amino acid attaches to the tRNA at its:

A
5' - end

B
3' - end

C
Anti codon site

D
DHU loop

Solution

AA-binding site (amino acid binding site) lies at the 3'end opposite the anticodon and has CCA-OH group. It is the site where aminacid attaches to the tRNA.
Question 6
1 / -0

To initiate translation, the mRNA first binds to:

A
The smaller ribosomal sub-unit,

B
The larger ribosomal sub-unit

C
The whole ribosome

D
No such specificity exists

Solution

The ribosome consists of structural RNAs and about 80 different proteins, in its inactive state, it exist as two subunits, a large subunit and a small subunit. When the smaller subunit encounters the mRNA, the process of translation of the mRNA to protein begins.
Question 7
1 / -0

In E.coli, the lac operon gets switched on when:

A
Lactose is present and it binds to the repressor

B
Repressor binds to operator

C
RNA polymerase binds to the operator

D
Lactose is present and it binds to RNA polymerase

Solution

In case of lactose presence

(i) Lactose acts as an inducer which binds to the repressor and forms an inactive repressor.

(ii) The repressor fails to bind to the operator region.

(iii) The RNA polymerase binds to the operator and transcript lac mRNA.

(iv) lac mRNA is polycistronic, i.e., produces all three enzymes, -galactosidase, permeaseand transacetylase.

(v) The lac operon is switched on.

In case of lactose absence

(i) When lactose is absent, i gene egulates and produces repressor mRNA which translate repression.

(ii) The repressor protein binds to the operator region of the operon and as a resultprevents RNA polymerase to bind to the operon.

(iii) The operon is switched off.
Question 8
1 / -0

Viviparity is considered to be more evolved because:

A
The young ones are left on their own

B
The young ones are protected by a thick shell

C
The young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival

D
The embryo takes a long time to develop

Solution

The young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival
Question 9
1 / -0

For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group bearing organisms is likely to be

A
42%

B
49%

C
9%

D
58%

Solution

The expected frequency of MN-blood group bearing organisms is likely to be 42%.
Question 10
1 / -0

Who supported Griffith effect by molecular explanation ?

A
Hershay and chase

B
Watson, crick Ninenberg

C
Avery , Mc Carty and Macleod

D
Griffith and Avery

Solution

Griffith's experiment was an experiment done in 1928 by Frederick Griffith. Supported by Avery, McLeod and McCarty and by Hershey and Chase.
Question 11
1 / -0

Name the conjugated protein used as genetic material in living cells

A
Glycoprotein

B
Nucleoprotein

C
Metalloprotein

D
Lipoprotein

Solution

Nucleoprotein used as genetic material in living cells.
Question 12
1 / -0

Which one of the following does not follow the central dogma of molecular biology ?

A
Pea

B
Mucor

C
Chlamydomonas

D
HIV

Solution

HIV does not follow the central dogma of molecular biology
Question 13
1 / -0

Polysome is formed by

A
A ribosome with several sub units

B
Ribosomes attached to each other in a linear arrangement

C
Several ribosomes attached to a single m RNA

D
Many ribosomes attached to a strand of endoplasmic reticulum

Solution

Several ribosomes attached to a single m RNA
Question 14
1 / -0

Anti parallel strands of a DNA molecule means that

A
One strand turns clockwise

B
One strand turns anticlockwise

C
The phosphate groups of two DNA strands , at their ends share the same position

D
The phosphate groups at the start of two DNA strands are is opposite position (Pole)

Solution

The phosphate groups at the start of two DNA strands are is opposite position (Pole)

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Re-Attempt Weekly Quiz Competition

Molecular Basis of Inheritance Test - 23

Result

Molecular Basis of Inheritance Test - 23

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SHARING IS CARING

Question 1

A-DNA

B-DNA

c DNA

r DNA

Solution

Question 2

5' - A U G A A U G - 3'

5' - U A C U U A C - 3

5' - C A U U C A U - 3'

5' - G U A A G U A - 3'

Solution

Question 3

The promoter, structural gene and the terminator region

The promoter and the terminator region

The structural gene and the terminator region

The structural gene only.

Solution

Question 4

5' - UAC - 3'

5' - CAU - 3'

5' - AUG - 3'

5' - GUA - 3'

Solution

Question 5

5' - end

3' - end

Anti codon site

DHU loop

Solution

Question 6

The smaller ribosomal sub-unit,

The larger ribosomal sub-unit

The whole ribosome

No such specificity exists

Solution

Question 7

Lactose is present and it binds to the repressor

Repressor binds to operator

RNA polymerase binds to the operator

Lactose is present and it binds to RNA polymerase

Solution

Question 8

The young ones are left on their own

The young ones are protected by a thick shell

The young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival

The embryo takes a long time to develop

Solution

Question 9

42%

49%

9%

58%

Solution

Question 10

Hershay and chase

Watson, crick Ninenberg

Avery , Mc Carty and Macleod

Griffith and Avery

Solution

Question 11

Glycoprotein

Nucleoprotein

Metalloprotein

Lipoprotein

Solution

Question 12

Pea

Mucor

Chlamydomonas

HIV

Solution