Biology Biomolecules MDCAT 2018
PMDC Verified Question 129 of 142
The number and sequence of amino acids along a polypeptide chain is called structure of a protein.
A
Tertiary
B
Quaternary
C
Secondary
D
Primary
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Primary
Concept:

The hierarchical levels of protein structure begin with the basic genetic blueprint.

Solution:

  • The most basic foundational level is the Primary structure.


  • It is defined strictly as the exact number, specific type, and linear sequence in which amino acids are strung together by covalent peptide bonds (directly dictated by mRNA).


Why other options are incorrect:

  • Secondary, Tertiary, Quaternary: These describe how that linear primary sequence bends, folds, and aggregates into three-dimensional space.

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