Which of the following DNA strands would complement the segment: ACTTGCA?

Rationale

TGAACGT is the DNA strand that complements ACTTGCA.

The complementary DNA strand is formed by pairing adenine (A) with thymine (T) and cytosine (C) with guanine (G). Therefore, when the original strand is ACTTGCA, the complementary strand will match these base-pairing rules, resulting in TGAACGT.

A (TGAACGT) CORRECT

This choice is correct because it follows the base pairing rules of DNA. Adenine (A) pairs with thymine (T), cytosine (C) pairs with guanine (G), and vice versa. The original sequence ACTTGCA, when matched according to these rules, will result in TGAACGT.

B (GACCATG) YOUR ANSWER

This option does not correctly complement the original strand. The base pairs do not match the required complementary pairs; for instance, the first base A in ACTTGCA should be complemented by T, but this sequence starts with G instead. Therefore, it does not fulfill the criteria for a complementary strand.

C (ACTTGCA) YOUR ANSWER

This choice simply repeats the original DNA strand without any complementary pairing. Since complementary strands must consist of different bases according to base pairing rules, this option fails to provide any complementary sequence.

D (None of the above) YOUR ANSWER

This choice implies that none of the options complement the original strand. However, since TGAACGT is indeed the correct complement, this statement is incorrect.

Conclusion

Identifying complementary DNA strands requires understanding the specific base pairing rules. In this case, TGAACGT correctly complements the original strand ACTTGCA, while the other options fail to provide valid complementary sequences. This principle is crucial in molecular biology and genetics, where accurate base pairing is essential for processes like DNA replication and transcription.

Which of the following DNA strands would complement the segment: ACTTGCA?

TGAACGT is the DNA strand that complements ACTTGCA.

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