Chapter 2 (Biological Molecules) F.Sc 1st Year Short Questions

Level: F.Sc (Pre-Engg)
Class: 1st Year
Board: Punjab Textbook Board
Subject: Biology
Chapter 2: Biological Molecules
Type: Short Questions
Author: Kiran Mehtab
Pages: 10
PDF Size: 2 MB

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Cellulose is digested by the herbivores but not by humans. Why?

In the herbivores (cow, buffalo etc.,) it is digested because of microorganisms (bacteria, yeasts, protozoa) in their digestive tract. These microorganisms secrete an enzyme called cellulase for its digestion. It is not digested in the human digestive tract as it lacks cellulase secreting organisms.

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What are lipids?

The lipids are a heterogeneous group of compounds related to fatty acids. They are insoluble in water but soluble in organic solvents such as ether, alcohol, chloroform and benzene. Lipids include fats, oils, waxes, cholesterol, and related compounds.

Why lipids store double the amount of energy as compared to the same amount of any carbohydrate?

Because of higher proportion of C-H bonds and very low proportion of oxygen, lipids store double the amount of energy as compared to the same amount of any carbohydrate.

What are different classes of lipids? OR classify lipids.

Lipids have been classified as acylglycerols, waxes; phospholipids. Sphingolipids, glycolipids and terpenoid – lipids including carotenoids and steroids.

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