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Molecular Basis of Inheritance · Question 107

AIPMT 2012 (Prelims)MCQMedium📈 Topic in 75% papers+4−1
1

Removal of RNA polymerase-III from nucleoplasm will affect the synthesis of

  1. tRNA
  2. hnRNA
  3. rRNA
  4. mRNA

Answer

(1) tRNA

Solution

As per NCERT, in eukaryotes there are three RNA polymerases in the nucleus:

RNA polymerase I ⇒ rRNAs (28S, 18S, 5.8S)

RNA polymerase II ⇒ hnRNA (precursor of mRNA)

RNA polymerase III ⇒ tRNA, 5S rRNA and snRNAs

∴ Removal of RNA polymerase III mainly affects tRNA synthesis.

Answer: (1)

AIPMT 2012 (Prelims)

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2

PCR and Restriction Fragment Length Polymorphism are the methods for

  1. Genetic transformation
  2. Genetic fingerprinting
  3. Study of enzymes
  4. DNA sequencing
AIPMT 2012 (Prelims)
3

The unequivocal proof of DNA as the genetic material came from the studies on a:

  1. Viroid
  2. Bacterium
  3. Fungus
  4. Bacterial virus
AIPMT 2011 (Mains)
4

Which one of the following also acts as a catalyst in a bacterial cell?

  1. 5S rRNA
  2. snRNA
  3. hnRNA
  4. 23S rRNA
AIPMT 2011 (Prelims)
5

What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope ?

  1. Nucleosomes
  2. Genes
  3. Nucleotides
  4. Base pairs
AIPMT 2011 (Prelims)
6

The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join -

  1. One nucleotide with another nucleotide
  2. One nitrogenous base with pentose sugar
  3. One nucleoside with another nucleoside
  4. One DNA strand with the other DNA strand
AIPMT 2010 (Mains)
7

The lac operon consists of -

  1. Three regulatory genes and three structural genes
  2. Four regulatory genes only
  3. Two regulatory genes and two structural genes
  4. One regulatory gene and three structural genes
AIPMT 2010 (Mains)
8

In eukaryotic cell transcription, RNA splicing and RNA capping take place inside the -

  1. Dictyosomes
  2. Ribosomes
  3. Nucleus
  4. ER
AIPMT 2010 (Mains)
9

Which one of the following statements about the particular entity is true?

  1. Nucleosome is formed of nucleotides
  2. Centromere is found in animal cells, which produces aster during cell division
  3. The gene for producing insulin is present in every body cell
  4. DNA consists of a core of eight histones
AIPMT 2010 (Mains)
10

Which one of the following does not follow the central dogma of molecular biology ?

  1. Mucor
  2. HIV
  3. Chlamydomonas
  4. Pea
AIPMT 2010 (Prelims)
11

The one aspect which is not a salient feature of genetic code, is its being –

  1. Specific
  2. Degenerate
  3. Ambiguous
  4. Universal
AIPMT 2010 (Prelims)

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