Tag: biology

Questions Related to biology

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 in 

  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

In eukaryotes, which of the following genes synthesise heterogeneous nuclear RNA 

  1. Holandric genes

  2. Split genes

  3. A-genes

  4. Z-genes


Correct Option: B

Which one of the following is NOT a component of lactose operon in bacteria?

  1. Operator

  2. Repressor

  3. Regulator

  4. Structural gene


Correct Option: A

The smallest unit of DNA capable of coding for the synthesis of a polypeptide is the ___________.

  1. Operon

  2. Promoter

  3. Cistron

  4. Replicon


Correct Option: A

In eukaryotes, removal of RNA polymerase III from nucleoplasm will affect transcription of  

  1. mRNA

  2. hnRNA

  3. tRNA

  4. 5.8 S rRNA

  5. 18 S rRNA


Correct Option: C