Biology Enzymes MDCAT 2017
PMDC Verified Question 71 of 79
All enzymes are ____
A
Fibrous proteins
B
Globular proteins
C
Low molecular weight proteins
D
Lipoproteins
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Globular proteins
Concept:

Enzymes are highly folded, complex molecules that act as biological catalysts to speed up chemical reactions within the body.

Solution:

  • Enzymes are composed of hundreds of amino acids joined together by peptide bonds.
  • They fold and coil upon themselves to form a specific three-dimensional, spherical shape known as a globular structure.
  • This globular shape is essential because it forms the highly specific active site required for substrate binding.


Why other options are incorrect:

Enzymes are not fibrous proteins (which are structural, like keratin or collagen) or lipoproteins, and they generally have very high molecular weights due to their long polypeptide chains.

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