Biology Biomolecules KMU 2024
PMDC Verified Question 18 of 142
Which is incorrect about the globular proteins?
A
Abundantly found in hair
B
Are spherical in shape
C
Have polypeptide chains
D
Soluble in water
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Abundantly found in hair
Concept:

Proteins are sharply divided into functional (globular) and structural (fibrous) categories based entirely on their shape and solubility.

Solution:

  • We must identify the strictly false statement.


  • Hair, nails, and outer skin are composed entirely of Keratin.


  • Keratin is a tough, insoluble, extended fibrous protein designed to be rigid and waterproof.


  • Therefore, stating that globular proteins are abundantly found in hair is completely incorrect.


Why other options are incorrect (they are TRUE statements):

  • Spherical in shape: True, the chains fold heavily inward into complex 3D globes (tertiary structure) to form active sites.


  • Soluble in water: True, they hide their hydrophobic R-groups on the inside, exposing hydrophilic groups on the outside to dissolve in blood/cytoplasm (e.g., enzymes, antibodies).


  • Have polypeptide chains: True, all proteins do.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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