Questions: If the sequence of one strand of DNA is TCGCACCGAT, what would be the sequence of the opposite (complementary) strand? AGCGUCCUA CTATGTTAGC AGCGTGGCTA TCGCACCGAT

The answer is the third one (C): AGCGTGGCTA.

Explanation for each option:

1. AGCGUCCUA: This sequence contains a 'U', which is found in RNA, not DNA. Therefore, this is incorrect for a DNA complementary strand.

2. CTATGTTAGC: This sequence does not correctly pair with the given DNA strand. The complementary base pairs for DNA are A-T and C-G, and this sequence does not follow that rule.

3. AGCGTGGCTA: This sequence correctly follows the base pairing rules for DNA. The original strand is TCGCACCGAT, and the complementary strand should be AGCGTGGCTA, where T pairs with A, C pairs with G, G pairs with C, and A pairs with T.

4. TCGCACCGAT: This is the original sequence, not the complementary strand. Therefore, it is incorrect.

In summary, the correct complementary DNA sequence is AGCGTGGCTA.