Biology Biomolecules MDCAT 2016
PMDC Verified Question 137 of 142
Secondary structure of protein is found in:
A
Trypsin
B
Keratin
C
Glucagon
D
Insulin
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Keratin
Concept:

Proteins generally fall into two broad structural classes: Fibrous and Globular.

Solution:

  • Fibrous proteins exist as long, parallel strands or sheets, primarily relying on highly repetitive Secondary structure to provide immense tensile strength.


  • Keratin (found in hair, nails, and feathers) is a classic fibrous protein dominated almost entirely by alpha-helical secondary structures wound together into supercoils.


Why other options are incorrect:

  • Trypsin (enzyme), Insulin & Glucagon (hormones): These are all Globular proteins, meaning they fold extensively into Tertiary structures to perform highly specific biochemical functions.

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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