Question

1. a dna sequence is shown.

5atcggctag3
which strand represents the complementary dna sequence?

Explanation:

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Also, the complementary strand has an antiparallel orientation. The given strand is \(5'\text{ATCGGCTAG}3'\).

• For each base in the original strand:
• A (in \(5'\) end) pairs with T (in \(3'\) end of complementary strand).
• T pairs with A.
• C pairs with G.
• G pairs with C.
• The antiparallel nature means if the original is \(5'\) to \(3'\), the complementary is \(3'\) to \(5'\).

Answer:

\(3'\text{TAGCCGATC}5'\) (assuming the first option in the image is \(3'\text{TAGCCGATC}5'\) as per the base - pairing and antiparallel rules)