If one strand of DNA has the bases GTCTA, which bases are on the opposite strand?
A: GTCTA
B: ATCTG
C: TAGAC
D: CAGAT
The bases on the opposite strand will be complementary to the original strand. In DNA, adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C).
The opposite strand to the given sequence GTCTA would be:
CAGAT
Therefore, the correct answer is D: CAGAT.