Central Dogma Of Molecular Biology

CENTRAL DOGMA OF MOLECULAR BIOLOGY

Q. 1 Assertion : Central dogma is the flow of information from DNA to mRNA and then decoding the information present in mRNA in the form of protein.
Reason : In retroviruses, reverse of central dogma occurs.

 A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

 B

If both assertion and reason are true but the reason is not the correct explanation of the assertion

 C

If the assertion is true but the reason is false

 D

If both the assertion and reason are false

Q. 1

Assertion : Central dogma is the flow of information from DNA to mRNA and then decoding the information present in mRNA in the form of protein.
Reason : In retroviruses, reverse of central dogma occurs.

 A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

 B

If both assertion and reason are true but the reason is not the correct explanation of the assertion

 C

If the assertion is true but the reason is false

 D

If both the assertion and reason are false

Ans. B

Explanation:

Answer: B If both assertion and reason are true but the reason is not the correct explanation of the assertion

  • Biosynthesis of protein is under direct control of DNA in most cases or else under the control of genetic RNA where DNA is absent. Sequences of bases in a particular segment of a polynucleotide chain will determine the sequence of amino acids in a particular polypeptide.
  • The relationship is popularly known as central dogma. Flow of information is one way i.e., from DNA, information is transferred to RNA (mRNA) and from RNA to protein.
  •  Temin (1970) reported that retroviruses operate a central dogma reverse or teminism inside host cells. Genomic RNA of these viruses first synthesizes DNA through reverse transcription. DNA then transfers information to messenger RNA which takes part in translation of the coded information to form polypeptide.

proteins

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