When mRNA molecules are formed,they are complementary to DNA with the exception that
A)an A in DNA matches a T in mRNA.
B)a T in DNA matches an C in mRNA.
C)an A in DNA matches a G in mRNA.
D)an A in DNA matches a U in mRNA.

Question

Quizplus · Accepted Answer

When mRNA molecules are formed, an A in DNA matches a U in mRNA instead of a T, as RNA has uracil (U) instead of thymine (T) as the base that pairs with adenine (A). Therefore, the mRNA molecule is complementary to the DNA strand except that it has U instead of T.

When MRNA Molecules Are Formed,they Are Complementary to DNA with the Exception