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Molecular Basis of Inheritance · Question 134

AIPMT 2005MCQEasy📈 Topic in 75% papers+4−1
1

Which one of the following makes use of RNA as a template to synthesize DNA -

  1. Reverse transcriptase
  2. DNA dependent RNA polymerase
  3. RNA polymerase
  4. DNA polymerase

Answer

(1) Reverse transcriptase

Solution

As per NCERT (central dogma), in some viruses the flow of information is in the reverse direction, i.e., from RNA to DNA.

⇒ This RNA-dependent DNA synthesis is catalysed by reverse transcriptase (e.g., in HIV, the viral RNA is copied into DNA by reverse transcriptase).

⇒ RNA polymerase (DNA dependent) makes RNA on DNA; DNA polymerase makes DNA on a DNA template.

Answer: (1)

AIPMT 2005

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2

During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at the point. What is the sequence called?

  1. TATA box
  2. GGTT box
  3. CAAT box
  4. AAAT box
AIPMT 2005
3

Production of a human protein in bacteria by genetic engineering is possible because

  1. The human chromosome can replicate in bacterial cell
  2. The genetic code is universal
  3. Bacterial cell can carry out the RNA splicing reactions
  4. The mechanism of gene regulation is identical in humans and bacteria
AIPMT 2005
4

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
AIPMT 2004
5

Which form of RNA has a structure resembling clover leaf ?

  1. r-RNA
  2. m-RNA
  3. t-RNA
  4. hn-RNA
AIPMT 2004
6

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
7

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
8

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
9

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
10

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
11

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

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