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Molecular Basis of Inheritance · Question 137

AIPMT 2004MCQMedium📈 Topic in 38% papers+4−1
1

During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and

  1. RNA primers are involved
  2. is facilitated by telomerase
  3. moves in one direction of the site
  4. moves in bi-directional way

Answer

(4) moves in bi-directional way

Solution

The circular bacterial chromosome has a single origin of replication (ori).

⇒ Two replication forks are formed at the origin and move away from it in opposite directions until they meet; i.e. replication is bidirectional.

Telomerase is not needed because a circular chromosome has no ends (telomeres).

Answer: (4)

AIPMT 2004

Keep practising — Molecular Basis of Inheritance

2

Which form of RNA has a structure resembling clover leaf ?

  1. r-RNA
  2. m-RNA
  3. t-RNA
  4. hn-RNA
AIPMT 2004
3

During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be -

  1. UAUGC
  2. TCTGG
  3. UATGC
  4. TATGC
AIPMT 2004
4

The following ratio is generally constant for a given species :-

  1. A+CT+G
  2. G+CA+T
  3. A+GC+T
  4. T+CG+A
AIPMT 2004
5

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
AIPMT 2004
6

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
7

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
8

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
9

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
10

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
11

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

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

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