Class 12th Biology 2011 Set3 Delhi Board Paper Solution

Question 19

(a) Identify A and B illustrations in the following:

PCR


(b) Write the term given to A and C.
(c) Expand PCR. Mention its importance in biotechnology.

Answer
(a) Labelled part A is called sticky end.
Labelled part B is a foreign DNA inserted into a vector.
 
(b) The term used for A and C is palindromic sequence, they are named because they can be read from both forward and backward.
 
(c) PCR stands for Polymerase Chain Reaction. PCR is a technique used to amplify a gene or a piece of DNA to obtain its several copies, extensively used in gene manipulation.