Na is made of nucleotides which are composed of a. a phosphate group, a sugar group and a nitrogenous base. b. a sugar group, an amino acid group and a nitrogenous base. c. a phosphate group, a starch group and a nitrogenous base. d. a protein group, a sugar group and a nitrogenous base.

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.