What is the complementary strand of RNA for the base sequence RNA 5'-GCATGAGCC-3'?

What is the complementary strand of RNA for the base sequence RNA 5'-GCATGAGCC-3'?

• A. 3'-CGUAGUCGG-5'
• B. 3'-CGUACUCGG-5'
• C. 3'-CGUUGUCGG-5'
• D. 3'-CGUAGUACG-5'

Answer: (A)

RNA base pairing follows G pairs with C and A pairs with U (T in DNA would pair with A, and in RNA the partner is U). Start with the given 5'-GCATGAGCC-3' strand and pair each base: G→C, C→G, A→U, T→A, G→C, A→U, G→C, C→G, C→G Reading the complementary strand in the antiparallel direction gives 3'-CGUACUCGG-5'. This is the sequence that would pair with the original RNA strand under proper RNA base-pairing rules.

RNA base pairing follows G pairs with C and A pairs with U (T in DNA would pair with A, and in RNA the partner is U). Start with the given 5'-GCATGAGCC-3' strand and pair each base:

G→C, C→G, A→U, T→A, G→C, A→U, G→C, C→G, C→G

Reading the complementary strand in the antiparallel direction gives 3'-CGUACUCGG-5'. This is the sequence that would pair with the original RNA strand under proper RNA base-pairing rules.