Chemistry Macromolecules / Biochemistry ETEA 2022
PMDC Verified Question 25 of 47
The linear arrangement of amino acid units in proteins is called:
A
Primary structure
B
Secondary structure
C
Tertiary structure
D
Quaternary structure
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Primary structure
Concept:

Protein architecture is organized from simple 1D sequences up to complex 3D multi-subunit structures.

Formula:

$$N/A$$

Solution:

  • The most basic level of protein structure is the simple, straight-chain sequence of amino acids linked end-to-end by covalent peptide bonds.
  • This specific linear arrangement is termed the primary structure.


Why other options are incorrect:

Secondary structure involves coiling into helices/sheets. Tertiary structure involves 3D folding of those helices/sheets. Quaternary involves the aggregation of multiple folded chains.

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