mMCQ.

Navigation Menu

Step into mMCQ.

Launch mMCQ. diagnostic

Explore mMCQ.

MDCAT prepFree DiagnosticPricing & SubscribeSign in

Resources

Terms & Conditions

mMCQ.

© 2021 - 2025 mMCQ.All rights reserved.

WhatsApp
  1. Home
  2. MDCAT
  3. Chemistry
  4. Chemistry of Life
MDCAT
Chemistry
2023

Chemistry · Chemistry of Life

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question

 Humans are unable to digest:

Options
  • A

    Starch

  • B

    Denatured protein

  • C

    Cellulose

  • D

    Fructose

Explanation

Humans are unable to digest cellulose, a type of complex carbohydrate (fiber) found in plant cell walls, due to the lack of the enzyme cellulase in our digestive system. Cellulase breaks down cellulose into simpler sugars, but since we don't produce it, cellulose passes through our digestive system undigested.

Humans can digest starch, a complex carbohydrate found in plant-based foods, using enzymes like amylase.

Denaturation changes protein structure, but it doesn't affect our ability to digest proteins. Humans have enzymes like proteases that break down proteins into amino acids.

Humans are unable to digest cellulose, a type of complex carbohydrate (fiber) found in plant cell walls, due to the lack of the enzyme cellulase in our digestive system. Cellulase breaks down cellulose into simpler sugars, but since we don't produce it, cellulose passes through our digestive system undigested.

Fructose is a simple sugar that can be easily absorbed and metabolized by humans.

Keep practising Chemistry

Take the free 2 minutes diagnostic to map weak topics, then unlock full Biology, Chemistry, Physics, English, and Logical Reasoning practice for PKR 15,000/month.

Start free diagnosticExplore MDCAT

Tagged under Chemistry · Chemistry of Life · 2023