If the fourth base in the original DNA strand (AAT-GCC-AGT-GGT-TCG-CAC) where changed from G to C, would it be...
AAT-GCC-AGT-CGT-TCG-CAC or
AAT-CCC-AGT-GGT-TCG-CAC
To determine the correct answer, we need to understand how DNA base pairing works. In DNA, adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C).
Given the original DNA strand: AAT-GCC-AGT-GGT-TCG-CAC
If the fourth base, G, is changed to C, we know that the new base must pair with it. Therefore, the complementary base to C is G.
So, the correct sequence would be:
AAT-GCC-AGT-CGT-TCG-CAC
Therefore, the answer is AAT-GCC-AGT-CGT-TCG-CAC.