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Molecular Basis of Inheritance · Question 78

NEET 2016 (Phase 1)MCQEasy📈 Topic in 88% papers+4−1
1

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

Answer

(1) lactose

Solution

As per NCERT, lactose is the substrate for the enzyme -galactosidase and it regulates switching on and off of the operon; hence it is termed the inducer.

⇒ The inducer binds the repressor and inactivates it, so RNA polymerase can transcribe the operon.

∴ Lactose is the inducer of the lac operon.

Answer: (1)

NEET 2016 (Phase 1)

Keep practising — Molecular Basis of Inheritance

2

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)
3

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)
4

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)
5

The equivalent of a structural gene is -

  1. cistron
  2. recon
  3. muton
  4. operon
NEET 2016 (Phase 2)
6

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)
7

A molecule that can act as a genetic material must fulfill the traits given below, except

  1. it should be able to express itself in the form of ‘Mendelian characters’
  2. it should be unstable structurally and chemically
  3. it should provide the scope for slow changes that are required for evolution
  4. it should be able to generate its replica
NEET 2016 (Phase 2)
8

DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the

  1. coding strand
  2. antistrand
  3. template strand
  4. alpha strand
NEET 2016 (Phase 2)
9

Which one of the following is not applicable to RNA?

  1. Complementary base pairing
  2. 5' phosphoryl and 3' hydroxyl ends
  3. Heterocyclic nitrogenous bases
  4. Chargaff's rule
AIPMT 2015
10

Identify the correct order of organisation of genetic material from largest to smallest :

  1. Chromosome, genome, nucleotide, gene
  2. Genome, chromosome, nucleotide, gene
  3. Genome, chromosome, gene, nucleotide
  4. Chromosome, gene, genome, nucleotide
AIPMT 2015
11

Satellite DNA is important because it :

  1. Shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.
  2. does not code for proteins and is same in all members of the population.
  3. codes for enzymes needed for DNA replication.
  4. codes for proteins needed in cell cycle.
AIPMT 2015

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