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Molecular Basis of Inheritance · Question 64

NEET (UG) 2019MatchingEasy📈 Topic in 88% papers+4−1
1

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)

Answer

(1) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Solution

As per NCERT, in the lac operon:

(a) The i gene (inhibitor) codes for the repressor (iii)

(b) The z gene codes for -galactosidase (i)

(c) The a gene codes for transacetylase (iv)

(d) The y gene codes for permease (ii)

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Answer: (1)

NEET (UG) 2019

Keep practising — Molecular Basis of Inheritance

2

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

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

Select the correct match :

  1. Alec Jeffreys - Streptococcus pneumoniae
  2. Alfred Hershey and Martha Chase - TMV
  3. Matthew Meselson and F. Stahl - Pisum sativum
  4. Francois Jacob and Jacques Monod - Lac operon
NEET 2018
4

Select the correct match :

  1. Ribozyme - Nucleic acid
  2. F2 Recessive parent - Dihybrid cross
  3. T.H. Morgan - Transduction
  4. G. Mendel - Transformation
NEET 2018
5

Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

  1. polysome
  2. polyhedral bodies
  3. plastidome
  4. nucleosome
NEET 2018
6

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

  1. AGGUAUCGCAU
  2. UGGTUTCGCAT
  3. ACCUAUGCGAU
  4. UCCAUAGCGUA
NEET 2018
7

All of the following are part of an operon except

  1. an operator
  2. structural genes
  3. an enhancer
  4. a promoter
NEET 2018
8

The final proof for DNA as the genetic material came from the experiments of

  1. Griffith
  2. Hargobind Khorana
  3. Avery, MacLeod and McCarty
  4. Hershey and Chase
NEET 2017
9

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?

  1. 1
  2. 11
  3. 333
  4. 33
NEET 2017
10

During DNA replication, Okazaki fragments are used to elongate

  1. The leading strand away from replication fork
  2. The lagging strand towards replication fork
  3. The lagging strand away from the replication fork
  4. The leading strand towards replication fork
NEET 2017
11

Which of the following RNAs should be most abundant in animal cell ?

  1. m-RNA
  2. mi-RNA
  3. r-RNA
  4. t-RNA
NEET 2017

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