Question

Which of the following best compares the structure of carbohydrates and nucleic acids?

Carbohydrates consist of monomers of carbon, hydrogen, and oxygen, while nucleic acids consist of monomers of a sugar, a phosphate group, and a nitrogenous base.

Carbohydrates have four rings containing carbon, hydrogen, and oxygen, while nucleic acids have subunits containing an amino acid and a phosphate group.

Carbohydrates contain carbon, hydrogen, and oxygen and have a hydrophobic end and a hydrophilic end, while nucleic acids contain a carbon backbone, a side change, and an amino group.

Answer 1

A is probably correct as as carbohydrate monomers are monosaccharides which are made up of Carbon, hydrogen and oxygen. The nucleic acid building blocks are correct.
B is probably wrong as carbon rings are normally a six ring structure.
C is wrong as nucleic acids consist of a sugar-phosphate backbone.

Answer 2

carbohydrates are made of monosaccharides where as nucliec acid is made of sugar, phosphate group and nitrogenous bases like adenine , guanine, thymine and cytosine.

Answer 3

Your question describes various classes of molecules: answer A is correct as Kovac 957 suggests, although I think that B first describes steroid - type molecules since they have four cycloalkane rings. (NB This is different to a ring of four carbons).Answer C first describes a fatty acid quite well.