Molecular Basis of Inheritance Test

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Molecular Basis of Inheritance Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following makes use of RNA as a template to synthesize DNA -

A
DNA dependant RNA polymerase

B
DNA polymerase

C
Reverse transcriptase

D
RNA polymerase
Question 2
1 / -0

The following ratio is generally constant for a given species :-

A
T + C / G + A

B
G + C / A+ T

C
A + C / T + G

D
A + G / C +T

Solution

The ratio of the sum of the adenine plus thymine bases to the sum of the guanine plus cytosine bases in a DNA molecule is called as G + C / A + T ratio. Generally, G + C / A + T ratio is constant for a given species. This ratio differs from species to species. However, it is constant for a given species. Species living in high temperature have high G + C / A + T ratio as it gives stability due to triple hydrogen bond between Guanine and Cytosine.
Thus, the correct answer is 'G + C / A+ T.'
Question 3
1 / -0

DNA is unique among molecules in that it can :

A
form multipolymerc omplexes

B
come apart and re-form

C
withstand very high temperatures

D
replicate itself
Question 4
1 / -0

Human genome project was discovered by

A
Francis Collins and Roderick

B
Watson and Crick

C
Beadle and Tatum

D
Paul Berg and Wollman
Question 5
1 / -0

A codon in mRNA has

A
3 bases

B
2 bases

C
1 base

D
Number of bases vary
Solution
- The sequence of amino acids in proteins depends on the sequence of nucleotides in DNA.
- The DNA produces mRNA molecules through the process of transcription. The mRNA is transported to the cytoplasm where it is translated into protein.
- A sequence of three nucleotides in mRNA specifies a particular amino acid in a protein chain.
  Hence, the genetic codon is a triplet.
  So the correct answer is A.
Question 6
1 / -0

Khorana and his colleague synthesized an RNA molecule with repeating sequences of U and G bases. The RNA with, UGUGUGUGUGUG produced a tetra-peptide with alternating sequences of cysteine and valine. This proves that codon for cysteine and valine is

A
UGG, GUU

B
UUG, GGU

C
UGU, GUG

D
GUG, UGU
Solution
- The three nucleotides together on mRNA is known as codon which codes for particular amino acids.
- The RNA has the sequence of UGUGUGUGUGUG that codes for tetrapeptides which contain only cysteine and valine.
- Thus, the codons UGU and GUG codes for cysteine and valine respectively.
Thus, the correct answer is option C.
Question 7
1 / -0

Double helix model of DNA which was proposed by Watson and Crick was of

A
C-DNA

B
B-DNA

C
D-DNA

D
Z-DNA

Solution

Watson and Crick described double helical model for secondary structure of B-form of DNA which is physiologically most important form of DNA. Later on several other forms of DNA were discovered like A form and Z form.
Question 8
1 / -0

B-DNA double helix makes a complete turn with

A
Every 10 base pairs

B
Every 20 base pairs

C
Every 36 base pairs

D
Every 3-6 base pairs

Solution

Watson and Crick proposed two strands of DNA - each in a right hand helix wound around the same axis. The two strands are held together by H-bonding between the bases. The diameter of B-DNA is 20$$\mathring A$$ and there are about 10 bases per helical turn (36$$^o$$ of twist along the helix for each base pair). The major groove is wide, while the minor groove is narrow. Owing to the location of the helical axis in the centre of the base pairs, the edges of the base pairs are about equally deep in the interior.
Question 9
1 / -0

The process of mRNA synthesis on a DNA is known as

A
Translation

B
Transcription

C
Transduction

D
Transformation

Solution

DNA is the repository of genetic information. DNA codes for proteins through mRNA. The process by which mRNA is synthesized on DNA template is called transcription. The genetic message in mRNA is later on translated into sequence of amino acids in proteins.
Question 10
1 / -0

If genetic code is tetraplet then what is the possible number of codons which code 20 types of amino acids?

A
261

B
64

C
256

D
43

Solution

At any given position in a nucleic acid, there are four possible nucleotides which can occur. There are two nucleotides containing purine bases and two containing pyrimidine bases. If the genetic codon is tetraplet, there will be 4x4x4x4 or 256 possible codons to code for 20 amino acids.
Thus, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Molecular Basis of Inheritance Test - 39

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Molecular Basis of Inheritance Test - 39

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SHARING IS CARING

Question 1

DNA dependant RNA polymerase

DNA polymerase

Reverse transcriptase

RNA polymerase

Question 2

T + C / G + A

G + C / A+ T

A + C / T + G

A + G / C +T

Solution

Question 3

form multipolymerc omplexes

come apart and re-form

withstand very high temperatures

replicate itself

Question 4

Francis Collins and Roderick

Watson and Crick

Beadle and Tatum

Paul Berg and Wollman

Question 5

3 bases

2 bases

1 base

Number of bases vary

Solution

Question 6

UGG, GUU

UUG, GGU

UGU, GUG

GUG, UGU

Solution

Question 7

C-DNA

B-DNA

D-DNA

Z-DNA

Solution

Question 8

Every 10 base pairs

Every 20 base pairs

Every 36 base pairs

Every 3-6 base pairs

Solution

Question 9

Translation

Transcription

Transduction

Transformation

Solution

Question 10

261

64

256

43

Solution

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