Central Dogma-transcription And Translation Test

Central Dogma-transcription And Translation

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

Questions & Answers

1
In the synthesis of which of the following, the DNA molecule is not directly involved?
  • A
    protein molecule
    Correct
  • B
    t-RNA molecule
  • C
    mRNA molecule
  • D
    another DNA molecule
2
Degeneracy of genetic code is due to
  • A
    Functional 20 codons and 20 amino acids
  • B
    Functional 64 codons and 20 amino acids
  • C
    Functional 61 codons and 20 amino acids
    Correct
  • D
    Functional 20 codons and 61 amino acids
3
What is not true for genetic code?
  • A
    It is degenerate
  • B
    It is nearly universal
  • C
    It is unambiguous
  • D
    A codon in mRNA is read in a non-contiguous fashion
    Correct
4
The region of t-RNA which consists of three bases complementary to a mRNA codon is
  • A
    Anticodon
    Correct
  • B
    Intron
  • C
    Codon
  • D
    Interferon
5
A DNA segment which serves as a kind of “ON-OFF switch” for transcription is a/an
  • A
    Operator
    Correct
  • B
    Structural gene
  • C
    Regulator gene
  • D
    Promoter
6
Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it?
  • A
    AUG- Cysteine
  • B
    AAA-Lysine
    Correct
  • C
    UUA-Valine
  • D
    CCC-Alanine
7
Central dogma of protein synthesis is
  • A
    \({\text{DNA}}\; \to {\text{DNA}}\; \to {\text{Protein}}\;\)
  • B
    \({\text{DNA}}\; \to {\text{Protein}}\; \to {\text{RNA}}\;\)
  • C
    \({\text{RNA}}\; \to {\text{DNA}}\; \to {\text{Protein}}\;\)
  • D
    \({\text{DNA}}\; \to {\text{RNA}}\; \to {\text{Protein}}\;\)
    Correct
8
During translation initiation in prokaryotes, a GTP molecule is needed in
  • A
    Association of 50 subunit of ribosome with initiation complex
  • B
    Association of 30S, mRNA with formyl-met-t RNA
    Correct
  • C
    Formation of formyl-met-t RNA
  • D
    Binding of 30 subunit of ribosome with mRNA
9
Why are UGA, UAG and UAA called termination codons?
  • A
    They are presenting at the beginning of mRNA
  • B
    They terminate anticodons
  • C
    They indicate initiation of translation
  • D
    They do not specify any amino acid
    Correct
10
Balbiani rings are the sites of
  • A
    RNA and Protein synthesis
    Correct
  • B
    DNA replication
  • C
    Synthesis of lipids
  • D
    Synthesis of polysaccharides