Question

the sequence of bases on one strand of dna is agcctag. replicate the dna with its base pair.
○ ctaggca
○ tcggatc
○ ucggauc
○ agcctag

Explanation:

Step1: Recall DNA base pairing rules

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). The given DNA strand is AGCCTAG.

Step2: Pair each base

• A pairs with T
• G pairs with C
• C pairs with G
• C pairs with G
• T pairs with A
• A pairs with T
• G pairs with C

So the complementary strand should be TCGGATC. Now check the options:

• Option 1: CTAGGCA – Incorrect pairing.
• Option 2: TCGGATC – Matches the complementary strand.
• Option 3: UCGGAUC – Contains uracil (U), which is in RNA, not DNA replication.
• Option 4: AGCCTAG – Same as original, not complementary.

Answer:

B. TCGGATC (assuming the options are labeled as A: CTAGGCA, B: TCGGATC, C: UCGGAUC, D: AGCCTAG)