Some questions must be answered with a cross in a box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
Genetic information is encoded in DNA.
The diagram below shows part of a DNA double helix.
Some parts are shown in the boxes labelled P, Q, R and S. One of the bonds is
labelled N.
For each of the statements below, put a cross in the boxnext to the correct answer.
One of the bases in box S is adenine, the other base in box S is
A cytosine
B guanine
C thymine
D uracil