The 3' End of DNA

Question

The 3' end of DNA
A)refers to the end that has a hydroxyl group attached to the number 3 carbon of deoxyribose.
B)attaches to the 5' phosphate group of the incoming nucleotide.
C)always has thymine attached to it.
D)usually has guanine attached to it.
E)refers to the end that has a hydroxyl group attached to the number 3 carbon of deoxyribose AND attaches to the 5' phosphate group of the incoming nucleotide.

Accepted Answer

The 3' end of DNA refers to the end that has a hydroxyl group attached to the number 3 carbon of deoxyribose, and it attaches to the 5' phosphate group of the incoming nucleotide. Therefore, choice E is the best answer. Choices A, C, and D are incorrect because they do not include the fact that the 3' end can attach to the 5' phosphate group of the incoming nucleotide.