3. The nucleotide at the end of one strand of a fragment of double-stranded DNA has a free phosphate attached to the 5' carbon of its deoxyribose sugar. The complementary nucleotide has
a. a free phosphate attached to the 3' carbon of its deoxyribose sugar
b. a hydroxyl group (-OH) attached to the 3' carbon of its deoxyribose sugar
c. a free phosphate attached to the 5' carbon of its deoxyribose sugar
d. a hydroxyl group attached to the 5' carbon of its deoxyribose sugar
e. two hydrogen atoms attached to the 3' carbon of its deoxyribose sugar