CBSE 2025 · Region 2 · Set 3 · Q20 · 2 marks
(a)Write the scientific name of the source organism of the thermostable DNA polymerase used in PCR.(b)State the advantage of using thermostable DNA polymerase.
(a)
Write the scientific name of the source organism of the thermostable DNA polymerase used in PCR.
(b)
State the advantage of using thermostable DNA polymerase.
Marking-scheme solution
(a) Thermus aquaticus
(b) Thermostable DNA polymerase remains active during the high temperature induced denaturation of double stranded DNA / It is not required to be added every time after denaturation in every cycle.
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.