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Molecular Basis of Inheritance · Question 153

AIPMT 2002MCQEasy📈 Topic in 88% papers+4−1
1

In E. coli, during lactose metabolism repressor binds to : -

  1. Promoter gene
  2. Operator gene
  3. Structural gene
  4. Regulator gene

Answer

(2) Operator gene

Solution

As per NCERT, the regulator gene (i) of the lac operon codes for the repressor protein.

In the absence of the inducer (lactose / allolactose), the repressor binds to the operator region and prevents RNA polymerase from transcribing the operon.

When lactose is present, it binds the repressor, which can no longer bind the operator, and transcription starts.

∴ The repressor binds to the operator gene.

Answer: (2)

AIPMT 2002

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2

Out of 64 codons, 61 codons code for 20 types of amino acids; it is called : -

  1. Wobbling of codon
  2. Universality of codons
  3. Overlapping of gene
  4. Degeneracy of genetic code
AIPMT 2002
3

Which of the following reunites the exon segments after RNA splicing ?

  1. RNA polymerase
  2. RNA proteases
  3. RNA primase
  4. RNA ligase
AIPMT 2002
4

Exon parts of mRNA have code for : -

  1. Lipid
  2. Protein
  3. Phospholipid
  4. Carbohydrate
AIPMT 2002
5

m-RNA is synthesised on DNA template in which direction : -

  1. Any
  2. Both (3) and (4)
  3. 5' → 3'
  4. 3' → 5'
AIPMT 2001
6

In Negative operon : -

  1. cAMP has negative effect on lac operon
  2. Co-repressor binds with inducer
  3. Co-repressor binds with repressor
  4. Co-repressor does not bind with repressor
AIPMT 2001
7

Gene and cistron words are sometimes used synonymously because : -

  1. One gene contains one cistron
  2. One cistron contains many genes
  3. One gene contains no cistron
  4. One gene contains many cistrons
AIPMT 2001
8

Types of RNA polymerase required in nucleus for RNA synthesis : -

  1. 2
  2. 3
  3. 1
  4. 4
AIPMT 2001
9

A mutant strain of T4 bacteriophage, R-II, fails to lyse E. coli, but when two strains R-IIX and R-IIY are mixed, they lyse E. coli. What may be the possible reason?

  1. Both strains have different cistrons
  2. Both strains have similar cistrons
  3. It is not mutated
  4. Bacteriophage transforms into wild type
AIPMT 2001
10

Method of DNA replication in which two strands of DNA separate and synthesize new strands

  1. Conservative
  2. Non conservative
  3. Dispersive
  4. Semiconservative
AIPMT 2000
11

Which of the following is initiation codon?

  1. AUC
  2. CCU
  3. UAG
  4. AUG
AIPMT 2000

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