Tag: expression of gene

Questions Related to expression of gene

Eucaryotic genome differs from procaryotic genome in

  1. DNA is circular arid single-stranded in procaryotes

  2. Intervening sequences are present in eucaryotic DNA

  3. DNA is coinplexed with histones in procaryotes

  4. DNA is organised into operons in eucaryotes


Correct Option: B

Operon is

  1. Sequence of three nitrogen bases determining a single amino acid

  2. A set of closely placed genes regulating a metabolic pathway in procaryotes

  3. Segment of DNA specifying a polypeptide

  4. Gene responsible for switching on and switching off of other genes


Correct Option: B

In eukaryotes transcription occurs in

  1. Cytoplasm

  2. Nucleus

  3. Cytosol

  4. Matrix


Correct Option: B

In an inducible operon, the genes are

  1. Usually expressed unless a signal turns them "off

  2. Never expressed

  3. Always expressed

  4. Usually not expressed unless a signal turns them on


Correct Option: D

In processing of eukaryotic hnRNA during protein-synthesis tailing involvesof RNA

  1. Addition of adenylate residues at 3' end

  2. Addition of methyl guanosine triphosphate at 3' end

  3. Addition of methyl guanosine triphosphate 5' end

  4. Removal of introns


Correct Option: A

In operon model, the function of regulator gene is to produce

  1. Repressor

  2. Inducer

  3. Corepressor

  4. DNA


Correct Option: A

The enzyme peptidyl transferase of prokaryotes resides inĀ 

  1. 50 S ribosome

  2. 30 S ribosome

  3. 40 S ribosome

  4. 60 S ribosome


Correct Option: A

Prokaryotic enzyme with 5'--> 3 exonuclease property is

  1. DNA polymerase I

  2. DNA polymerase II

  3. DNA polymerase III

  4. Both A and C


Correct Option: A

Which of the following DNA polymerase of prokarytoes have both 3' - 5' and 5' - 3' exonuclease activity

  1. DNA Pol-II

  2. DNA Pol-I

  3. DNA Pol-IV

  4. DNA Pol-III


Correct Option: B

Prokaryotes can be distinguished from eukaryotes as they lack

  1. RNA

  2. Ribosomes

  3. Gene discontinuity

  4. Unique DNA sequences


Correct Option: C