Gene Expression And Regulation Test

Gene Expression And Regulation

This is online test 02 for CBSE class 12 Biology Molecular Basis of Inheritance (Gene expression and regulation).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
Write and codon for anticodon on the t-RNA
Question 1 figure 1
  • A
    AGU
    Correct
  • B
    UGA
  • C
    UGU
  • D
    ACU
2
During protein synthesis, AUG functions as the initiator codon in mRNA. What should be the anticodon on the t-RNA molecule that picks up and brings the amino acid specified by this codon?
  • A
    TAC
  • B
    GUA
  • C
    CAU
  • D
    UAC
    Correct
3
According to the lac-operon concept, which functional unit of the bacterial gene material is responsible for suppressing the activity of the operator gene in the absence of lactose?
  • A
    Repressor protein
  • B
    Structural gene
  • C
    Promoter gene
  • D
    Regulator gene
    Correct
4
Removal of introns and joining of exons in a defined order during transcription is called
  • A
    Splicing
    Correct
  • B
    Looping
  • C
    Inducing
  • D
    Slicing
5
What does "lac" refer to in what we call the lac operon?
  • A
    Lactose
    Correct
  • B
    Lactase
  • C
    The number 1,00,000
  • D
    Lac insect
6
The primary control of gene expression takes place at the level of
  • A
    Transcription
    Correct
  • B
    DNA replication
  • C
    None of the above
  • D
    Translation
7
The sequence of structural gene in lac operon concept is
  • A
    lac A, lac Y, lac Z
  • B
    lac Y, lac Z, lac A
  • C
    lac A, lac Z, lac Y
  • D
    lac Z, lac Y, lac A
    Correct
8
Removal of RNA polymerase III from nucleoplasm will affect the synthesis of
  • A
    hn-RNA
  • B
    t-RNA
    Correct
  • C
    r-RNA
  • D
    m-RNA
9
Production of a human protein in bacteria by genetic engineering is possible because
  • A
    The human chromosome can replicate in bacterial cell
  • B
    Bacterial cell can carry out the RNA splicing reactions
  • C
    The mechanism of g ene regulation is identical in human and bacteria
  • D
    The genetic code is universal
    Correct
10
What does X replesent in the followwing diagram:
Question 10 figure 1
  • A
    Released tertiary protein
  • B
    Released polypeptide chain
    Correct
  • C
    Released 3D protein molecule
  • D
    Released secondary protein