Question

A nucleotide sequence of AACT in DNA would be transcribed (copied) as __________ in RNA.

A. UUCT
B. TTGA
C. UUGA
D. none of the above

Answer 1

When a DNA strand is copied, the A in the old strand pair with T in the new strand, the Ts pair with As, the Cs pair with the Gs and the Gs pair with Cs:

A --> T
T --> A
C --> G
G --> C

The only twist is that when the DNA strands are copied into RNA, the As pair not with thymine T but with uracil, U.