MDCAT Biology MCQ #763

A structural diagram of hemoglobin shows four subunits clustered together. This level of organization is specifically referred to as:

MDCAT Biology MCQ #763

  1. Question 1

    Q1. A structural diagram of hemoglobin shows four subunits clustered together. This level of organization is specifically referred to as:

    • A) Primary structure
    • B) Secondary structure
    • C) Tertiary structure
    • D) Quaternary structure

    Answer: Quaternary structure

    Explanation: Hemoglobin consists of four separate polypeptide chains (2 alpha, 2 beta). Tertiary is tempting but only refers to a single folded chain.