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Molecular Basis of Inheritance · Question 154

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(4) Degeneracy of genetic code

Solution

As per NCERT, 61 codons code for amino acids and 3 codons (UAA, UAG, UGA) are stop codons.

∵ 61 codons code for only 20 amino acids ⇒ most amino acids are coded by more than one codon (e.g., leucine by six codons).

As per NCERT, some amino acids are coded by more than one codon, hence the code is degenerate.

∴ This property is called degeneracy of the genetic code.

Answer: (4)

AIPMT 2002

Keep practising — Molecular Basis of Inheritance

2

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
3

Exon parts of mRNA have code for : -

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

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
5

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
6

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
7

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

  1. 2
  2. 3
  3. 1
  4. 4
AIPMT 2001
8

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
9

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
10

Which of the following is initiation codon?

  1. AUC
  2. CCU
  3. UAG
  4. AUG
AIPMT 2000
11

Anticodon occurs in:

  1. DNA
  2. r-RNA
  3. t-RNA
  4. m-RNA
AIPMT 2000

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