MDCAT Biology MCQ #879

All 20 types of amino acids found in proteins have a common basic structure. Which part of the molecule varies between different amino acids?

MDCAT Biology MCQ #879

  1. Question 1

    Q1. All 20 types of amino acids found in proteins have a common basic structure. Which part of the molecule varies between different amino acids?

    • A) Amino group
    • B) R-group
    • C) Carboxyl group
    • D) Hydrogen atom

    Answer: R-group

    Explanation: While all amino acids share the amino and carboxyl groups, the R-group (side chain) determines the specific identity and properties of the amino acid.