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Molecular Basis of Inheritance · Question 141

AIPMT 2004MCQEasy📈 Topic in 25% papers+4−1
1

DNA fingerprinting refers to :-

  1. Techniques used for molecular analysis of different specimens of DNA
  2. Analysis of DNA samples using imprinting devices
  3. Molecular analysis of profiles of DNA samples
  4. Techniques used for identification of fingerprints of individuals

Answer

(3) Molecular analysis of profiles of DNA samples

Solution

As per NCERT, DNA fingerprinting involves identifying differences in some specific regions in DNA sequence called repetitive DNA (VNTRs, satellite DNA).

⇒ DNA isolated from a sample is cut by restriction enzymes, separated by electrophoresis, blotted and hybridised with a labelled VNTR probe; the band pattern obtained is the DNA profile of that individual.

∴ DNA fingerprinting is the molecular analysis of profiles of DNA samples; it has nothing to do with the fingerprints of fingers.

Answer: (3)

AIPMT 2004

Keep practising — Molecular Basis of Inheritance

2

The telomeres of eukaryotic chromosomes consist of short sequences of

  1. Adenine rich repeats
  2. Cytosine rich repeats
  3. Thymine rich repeats
  4. Guanine rich repeats
AIPMT 2004
3

What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA?

  1. A polypeptide of 49 amino acids will be formed
  2. A polypeptide of 25 amino acids will be formed
  3. Two polypeptides of 24 and 25 amino acids will be formed
  4. A polypeptide of 24 amino acids will be formed
AIPMT 2003
4

What does "lac" refer to in what we call the lac operon?

  1. The number 1,00,000
  2. Lac insect
  3. Lactase
  4. Lactose
AIPMT 2003
5

During translation initiation in prokaryotes, a GTP molecule is needed in:

  1. Association of 30S-mRNA with formyl-met-tRNA
  2. Formation of formyl-met-tRNA
  3. Association of 50S subunit of ribosome with initiation complex
  4. Binding of 30S subunit of ribosome with mRNA
AIPMT 2003
6

Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as 'start' or 'stop' codon?

  1. UUU – Stop
  2. UAC – Tyrosine
  3. UGU – Leucine
  4. UCG – Start
AIPMT 2003
7

During transcription, the DNA site at which RNA polymerase binds is called:

  1. Receptor
  2. Regulator
  3. Enhancer
  4. Promoter
AIPMT 2003
8

Degeneracy of a genetic code is attributed to the:

  1. Second member of a codon
  2. Third member of a codon
  3. First member of a codon
  4. Entire codon
AIPMT 2003
9

In the genetic code dictionary, how many codons are used to code for all the 20 amino acids:

  1. 64
  2. 20
  3. 60
  4. 61
AIPMT 2003
10

In a DNA percentage of thymine is 20% then what is the percentage of guanine : -

  1. 40%
  2. 20%
  3. 30%
  4. 60%
AIPMT 2002
11

Transformation experiment was first performed on which bacterium : -

  1. Diplococcus pneumoniae
  2. Pasteurella pestis
  3. E. coli
  4. Salmonella
AIPMT 2002

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