CBSE 2023 · Region 3 · Set 1 · Q11 · 1 mark
The given schematic illustration shows three steps 'P', 'Q' and 'R' of the polymerase chain reaction. Step 'P'
Step 'Q' Step 'R' Which of the following statements are correct with reference to the illustration given above ?(i)Step 'P' is showing denaturation at low temperature.(ii)Step 'Q' is a denaturation of DNA strand at high temperature, followed by annealing.(iii)Step 'R' is an extension of DNA in presence of thermostable DNA polymerase.(iv)Step 'Q' is extension with two sets of primers.
The given schematic illustration shows three steps 'P', 'Q' and 'R' of the polymerase chain reaction. Step 'P'
Step 'Q' Step 'R' Which of the following statements are correct with reference to the illustration given above ?
(i)
Step 'P' is showing denaturation at low temperature.
(ii)
Step 'Q' is a denaturation of DNA strand at high temperature, followed by annealing.
(iii)
Step 'R' is an extension of DNA in presence of thermostable DNA polymerase.
(iv)
Step 'Q' is extension with two sets of primers.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
(ii) and (iii) only
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CBSE Class 12 Biology past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.