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Molecular Basis of Inheritance · Question 55

NEET (UG) 2021MCQEasy📈 Topic in 25% papers+4−1
1

In the light of the above statements, choose the correct answer from the options given below.

  1. Statement I is incorrect but Statement II is true
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is correct but Statement II is false

Answer

(1) Statement I is incorrect but Statement II is true

Solution

Statement I: As per NCERT, AUG has dual functions — it codes for methionine (met) and also acts as the initiator codon. Phenylalanine is coded by UUU (and UUC), not by AUG — incorrect.

Statement II: The genetic code is degenerate; both AAA and AAG code for lysine — correct.

∴ Statement I is incorrect but Statement II is true.

Answer: (1)

NEET (UG) 2021

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2

If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 109 bp, then the length of the DNA is approximately

  1. 2.7 meters
  2. 2.0 meters
  3. 2.5 meters
  4. 2.2 meters
NEET (UG) 2020
3

Which of the following statements is correct?

  1. Adenine does not pair with thymine
  2. Adenine pairs with thymine through one H-bond
  3. Adenine pairs with thymine through two H-bonds
  4. Adenine pairs with thymine through three H-bonds
NEET (UG) 2020
4

The first phase of translation is

  1. Recognition of an anti-codon
  2. Recognition of DNA molecule
  3. Binding of mRNA to ribosome
  4. Aminoacylation of tRNA
NEET (UG) 2020
5

Name the enzyme that facilitates opening of DNA helix during transcription.

  1. DNA polymerase
  2. RNA polymerase
  3. DNA helicase
  4. DNA ligase
NEET (UG) 2020
6

Purines found both in DNA and RNA are:

  1. Guanine and cytosine
  2. Cytosine and thymine
  3. Adenine and thymine
  4. Adenine and guanine
NEET (UG) 2019
7

Expressed Sequence Tags (ESTs) refers to :

  1. DNA polymorphism
  2. Novel DNA sequences
  3. Genes expressed as RNA
  4. Polypeptide expression
NEET (UG) 2019
8

Under which of the following conditions will there be no change in the reading frame of following mRNA? 5' AACAGCGGUGCUAUU 3'

  1. Insertion of A and G at 4th and 5th positions respectively
  2. Deletion of GGU from 7th, 8th and 9th positions
  3. Insertion of G at 5th position
  4. Deletion of G from 5th position
NEET (UG) 2019
9

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

  1. Genetic code is nearly universal
  2. Genetic code is specific
  3. Genetic code is not ambiguous
  4. Genetic code is redundant
NEET (UG) 2019
10

Match the following genes of the Lac operon with their respective products : Select the correct option.

  1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  3. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
  4. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
NEET (UG) 2019
11

The experimental proof for semi-conservative replication of DNA was first shown in a

  1. fungus
  2. bacterium
  3. plant
  4. virus
NEET 2018

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