Proteins, carbohydrates, and nucleic acids are all polymers. what repeating subunit is each made of?

Amino acids. These class of compounds are considered the building blocks of most organisms, and around 500 of these are known and indentified. All proteins, carbohydrates, and nucleic acids are polymers ("many units") and each unit is an amino acid. 

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .