Consider these statements about the structural features of nucleic acids. Some are true only for DNA or RNA, some are true for both, and some do not fit either. 1. Which of the following statements is true for DNA only?

a. It contains the pyrimidine uracil.
b. It contains a 2 hydroxy group.
c. It contains the sugar 2-deoxyribose.
d. Bases are attached to sugars in an a-N-glycosidic linkage.

2. Which Of the following Statements is true for both DNA and RNA?

a. In base composition, %A = %C always.
b. Sugars are connected with a 3-5 phosphodiester link.
c. In base composition, %G = %C.
d. Both can be hydrolyzed in alkaline solution.

3. Which of the following statements is true for only RNA?

a. It contains the purine adenine.
b. It commonly exists in a variety of secondary structures.
c. The secondary structure is primarily a double helix.
d. Sugars are connected with a 3-5' phosphodiether link.