Which of the following types of molecules contains the most energy per gram? a
Proteins
OOO
Lipids
Carbohydrates
с

Proteins contain about 4,1 kcal/gram

carbohydrates contain about 4,1kcal/gram

lipids contain about 9,1 kcal/gram

so the answer is lipids

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.