During DNA replication, a DNA strand that has the bases CTAGGT produces a complementary strand with which sequence of bases?

• A. GATCCA
• B. CTAGGT
• C. GCTACC
• D. TAGGCT

Answer: (A)

Verified step by step guidance

1. Recall the base pairing rules in DNA replication: Cytosine (C) pairs with Guanine (G), and Adenine (A) pairs with Thymine (T).
2. Write down the original DNA strand: CTAGGT.
3. For each base in the original strand, determine its complementary base using the pairing rules: C \(\rightarrow\) G, T \(\rightarrow\) A, A \(\rightarrow\) T, G \(\rightarrow\) C.
4. Apply this to each base in the sequence CTAGGT to get the complementary strand.
5. Combine the complementary bases in the same order to form the full complementary strand.