Question

what is the purpose of the r group in an amino acid monomer?
determines digestion rate
there is no function
shape and function
determine type of fatty acid

Explanation:

The R - group in an amino - acid monomer varies among different amino acids and determines the unique shape and function of the amino acid, as well as the protein it is a part of. It can be non - polar, polar, acidic, or basic, influencing interactions like hydrogen bonding, hydrophobic interactions, etc.

Answer:

shape and function