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Molecular Basis of Inheritance · Question 155

AIPMT 2002MCQEasy📈 Topic in 75% papers+4−1
1

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

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

Answer

(4) RNA ligase

Solution

In eukaryotes the primary transcript (hnRNA) contains exons and introns.

As per NCERT, during splicing the introns are removed and the exons are joined in a defined order.

The joining of the cut ends of exons is a ligation reaction (formation of a phosphodiester bond), carried out by RNA ligase.

∴ RNA ligase reunites the exon segments after splicing.

Answer: (4)

AIPMT 2002

Keep practising — Molecular Basis of Inheritance

2

Exon parts of mRNA have code for : -

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

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
4

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
5

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
6

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

  1. 2
  2. 3
  3. 1
  4. 4
AIPMT 2001
7

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
8

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
9

Which of the following is initiation codon?

  1. AUC
  2. CCU
  3. UAG
  4. AUG
AIPMT 2000
10

Anticodon occurs in:

  1. DNA
  2. r-RNA
  3. t-RNA
  4. m-RNA
AIPMT 2000
11

Length of one loop of B-DNA:

  1. 20 nm.
  2. 10 nm.
  3. 3.4 nm.
  4. 0.34 nm.
AIPMT 2000

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