Central Dogma-transcription And Translation Test

Central Dogma-transcription And Translation

This is online test 03 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
During replication of DNA, Okazaki fragments are formed in the direction of :
  • A
    \(3' \to 5'\)
  • B
    \(5' \to 5'\)
  • C
    \(5' \to 3'\)
    Correct
  • D
    \(3' \to 3'\)
2
The sequence of events mentioned below is symbolized by alphabets. Choose the correct answer where the alphabets are matched with the processes. RNA —(A)—> DNA —(B)—> DNA —(C)—> mRNA —(D)—> Polypeptide
  • A
    A= Reverse transcription, B= Replication, C=Transcription, D=Translation
    Correct
  • B
    A=Replication, B=Transcription, C=Translation, D=Transduction
  • C
    A=Reverse transcription, B=Translation, C=Transcription, D=Replication
  • D
    A=Replication, B=Transformation, C=Transcription, D=Translation
3
During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is its DNA-binding sequence?
  • A
    AATT
  • B
    CACC
  • C
    TTAA
  • D
    TATA
    Correct
4
If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence?
  • A
    AACTG
  • B
    TTAGU
  • C
    ATCGU
  • D
    UAGAC
    Correct
5
If the sequence of one strand of DNA is written as follows:
  • A
    5’--TACGTACGTACGGCATGCATGCATGCAT-3’
  • B
    5'-ATGCATGCATGCATGCATGCATGCATGC-3'
    Correct
  • C
    5’-GCATGCATGCATGCATGCATGCATGCAT-3’
  • D
    5’-TACGTACGTACGTACGTACGTACGTACG-3’
6
What would be the sequence of nitrogen bases in the mRNA that is synthesized by the corresponding region of the coding strand in that DNA?
  • A
    CAUGUUUAUCGG
  • B
    None of these
    Correct
  • C
    GTACAA ATA GCC
  • D
    GUACAAAUAGCC
7
Assertion: UAA codon is a termination codon. Reason: If in a mRNA, a termination codon is present, the protein synthesis stops abruptly whether the protein synthesis is complete or not.
  • A
    Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
    Correct
  • B
    Both Assertion and Reason are false
  • C
    Both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion
8
Assertion: Replication and transcription occur in the nucleus but translation occurs in the cytoplasm. Reason: mRNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acids are available for protein synthesis.
  • A
    Both Assertion and Reason are false
  • B
    Assertion is true, but Reason is false
  • C
    Both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion
  • D
    Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
    Correct
9
Transcription is the coping of genetic information form DNA to mRNA and translation is the formation of polypeptide chain according to code to form protein. Which one follows the other?
  • A
    Transcription is not related to translation
  • B
    Translation is followed by transcription
    Correct
  • C
    Transcription is followed by translation
  • D
    Both transcription and translation occurs together
10
Number of nitrogenous bases in a Codon is
  • A
    2
  • B
    3
    Correct
  • C
    1
  • D
    5