NEET Botany Molecular Basis of Inheritance Questions Solved

BOARD

(a) State the ‘Central dogma’ as proposed by Francis Crick.     (5 marks)

Are there any exceptions to it ? Support your answer with

a reason and an example.

(b) Explain how the biochemical characterisation (nature)

of ‘Transforming Principle’ was determined, which was not

defined from Griffith’s experiments.

 

(a) 

Yes , in some viruses flow of information is in reverse direction / reverse transcription = ½ + ½

e.g. Any Retrovirus / HIV = ½

(b) Protein and DNA and RNA were purified from heat killed S strain / smooth

Streptococcus / Diplococcus pneumoniae = ½

Protein + Protease transformation occured (R cell to S type) =½

RNA + RNA ase transformation occured (R cell to S type) =½

DNA + DNA ase transformation inhibited = ½

Hence DNA alone is the transforming material = ½

                                                                          (2+3 marks)

Difficulty Level:

  • 85%
  • 8%
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