For each of the questions (a) to (j), choose an answer A, B, C or D and put a cross in the
box . Mark only one answer for each question. If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
(a) Which of these statements is correct for the structure of DNA?
(1)
A single-stranded with the base pairs AG and CT
B double-stranded with the base pairs AG and CT
C single-stranded with the base pairs AT and CG
D double-stranded with the base pairs AT and CG