Which of the following is correct?
a. the purine g bonds with the purine
c. b. the purine c bonds with the pyrimidine g.
c. the pyrimidine c bonds with the purine g.
d. the pyrimidine c bonds with the pyrimidine g.

The correct answer is C. Cytosine or C is a pyrimidine while Guanine or G is a purine. Purines are double ringed nitrogenous bases namely adenine and guanine while pyrimidines are single ringed nitrogenous bases namely cytosine, thymine and uracil. According to base pairing rules, adenine will always pair with thymine while guanine will always pair with cytosine in DNA. In RNA, Guanine will always pair with cytosine while adenine will always pair with uracil instead of thymine. RNA does not have thymine in its structure.

Processes above and be sure to mention the movement of electrons and energy as the carbon atom moves from one reaction to another.

Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes