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Molecular Basis of Inheritance · Question 72

NEET 2017MCQMedium📈 Topic in 25% papers+4−1
1

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?

  1. 1
  2. 11
  3. 333
  4. 33

Answer

(4) 33

Solution

Each codon is a triplet ⇒ 999 bases = 333 codons.

Base 901 lies in codon number 901+23 = 301 (codon 301 = bases 901–903).

⇒ A deletion shifts the reading frame (frameshift) from that point onwards.

⇒ Codons 1 to 300 remain unchanged; codons 301 to 333 are altered.

∴ Number of altered codons = 333 - 300 = 33

Answer: (4)

NEET 2017

Keep practising — Molecular Basis of Inheritance

2

During DNA replication, Okazaki fragments are used to elongate

  1. The leading strand away from replication fork
  2. The lagging strand towards replication fork
  3. The lagging strand away from the replication fork
  4. The leading strand towards replication fork
NEET 2017
3

Which of the following RNAs should be most abundant in animal cell ?

  1. m-RNA
  2. mi-RNA
  3. r-RNA
  4. t-RNA
NEET 2017
4

Spliceosomes are not found in cells of :

  1. Bacteria
  2. Plants
  3. Animals
  4. Fungi
NEET 2017
5

The association of histone H1 with a nucleosome indicates :

  1. DNA replication is occurring
  2. Transcription is occurring
  3. The DNA is condensed into a Chromatin Fibre
  4. The DNA double helix is exposed
NEET 2017
6

Which one of the following is the starter codon ?

  1. AUG
  2. UAG
  3. UAA
  4. UGA
NEET 2016 (Phase 1)
7

Which of the following is required as inducer(s) for the expression of Lac operon?

  1. lactose
  2. lactose and galactose
  3. glucose
  4. galactose
NEET 2016 (Phase 1)
8

A complex of ribosomes attached to a single strand of RNA is known as :

  1. Polypeptide
  2. Okazaki fragment
  3. Polysome
  4. Polymer
NEET 2016 (Phase 1)
9

Which of the following is not required for any of the techniques of DNA fingerprinting available at present?

  1. DNA – DNA hybridization
  2. Polymerase chain reaction
  3. Zinc finger analysis
  4. Restriction enzymes
NEET 2016 (Phase 1)
10

Taylor conducted the experiments to prove semiconservative mode of chromosome replication on

  1. Vicia faba
  2. Drosophila melanogaster
  3. Vinca rosea
  4. E. coli
NEET 2016 (Phase 2)
11

The equivalent of a structural gene is -

  1. cistron
  2. recon
  3. muton
  4. operon
NEET 2016 (Phase 2)

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