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Molecular Basis of Inheritance · Question 73

NEET 2017MCQMedium📈 Topic in 38% papers+4−1
1

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

Answer

(3) The lagging strand away from the replication fork

Solution

DNA polymerase can polymerise only in the 5' 3' direction.

⇒ On the template with 3' 5' polarity, replication is continuous (leading strand).

⇒ On the template with 5' 3' polarity, replication is discontinuous; the short pieces (Okazaki fragments) are synthesised in the direction away from the replication fork and later joined by DNA ligase.

∴ Okazaki fragments elongate the lagging strand away from the replication fork.

Answer: (3)

NEET 2017

Keep practising — Molecular Basis of Inheritance

2

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
3

Spliceosomes are not found in cells of :

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

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
5

Which one of the following is the starter codon ?

  1. AUG
  2. UAG
  3. UAA
  4. UGA
NEET 2016 (Phase 1)
6

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)
7

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)
8

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)
9

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)
10

The equivalent of a structural gene is -

  1. cistron
  2. recon
  3. muton
  4. operon
NEET 2016 (Phase 2)
11

Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria ?

  1. 5.8 S rRNA
  2. 23 S rRNA
  3. 18 S rRNA
  4. 5 S rRNA
NEET 2016 (Phase 2)

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