In-Text Figure Based Questions
-What structural differences make adenine and guanine different from cytosine, thymine, and uracil? (Figure 2-24)

A) Adenine and guanine have a phosphate group, while cytosine, thymine, and uracil do not.
B) Adenine and guanine do not have a phosphate group, while cytosine, thymine, and uracil do.
C) Adenine and guanine are double-ringed nitrogenous bases, while cytosine, thymine, and uracil are single-ringed.
D) Adenine and guanine are single-ringed nitrogenous bases, while cytosine, thymine, and uracil are double-ringed.
E) Adenine and guanine have ribose as the sugar, while cytosine, thymine, and uracil have deoxyribose.