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Molecular Basis of Inheritance · Question 151

AIPMT 2002MCQEasy📈 Topic in 50% papers+4−1
1

Transformation experiment was first performed on which bacterium : -

  1. Diplococcus pneumoniae
  2. Pasteurella pestis
  3. E. coli
  4. Salmonella

Answer

(1) Diplococcus pneumoniae

Solution

As per NCERT, in 1928 Frederick Griffith performed a series of experiments with Streptococcus pneumoniae (pneumococcus), earlier named Diplococcus pneumoniae.

Heat-killed S-strain bacteria converted living R-strain bacteria into virulent S-strain; this was called transformation.

∴ The transformation experiment was first performed on Diplococcus pneumoniae.

Answer: (1)

AIPMT 2002

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2

Jacob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept is applicable for :

  1. All prokaryotes and all eukaryotes
  2. All prokaryotes and some protozoans
  3. All prokaryotes
  4. All prokaryotes and some eukaryotes
AIPMT 2002
3

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

  1. Promoter gene
  2. Operator gene
  3. Structural gene
  4. Regulator gene
AIPMT 2002
4

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
5

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
6

Exon parts of mRNA have code for : -

  1. Lipid
  2. Protein
  3. Phospholipid
  4. Carbohydrate
AIPMT 2002
7

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
8

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
9

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
10

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

  1. 2
  2. 3
  3. 1
  4. 4
AIPMT 2001
11

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

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