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

What are acylglycerols?

Chemically; acylglycerols can be defined as esters of fatty acids and alcohol. Acylglycerols are composed of glycerol and fatty acids. The most widely spread acylgycerol is triacyl glcerol, also called triglycerides or neutral lipids.

What is an ester? Express it with an equation.

An ester is a compound produced as a result of a chemical reaction of an alcohol with an acid and a water molecule is released.

Differentiate between saturated and unsaturated fatty acids. Give examples.

The fatty acids which contain no double bond are called saturated fatty acids e.g., acetic acid, butyric acid, palmitic acid while those which have up to 6 double bonds are called unsaturated fatty acids e.g., Oleic Acid.

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How fatty acids of animals differ from those of plants?

In animals the fatty acids are straight chains, while in plants these may be branched or ringed. 59. Compare the solubility and melting points of palmitic and butyric acids. Ans: Palmitic acid (C16) is much more soluble in organic solvent than butyric acid (CA). The melting point of palmitic acid is 63.1°C as against -8°C for butyric acid.

Give examples of fibrous proteins.

Examples are silk fibre (from silk worm, and spiders web), myosin (in muscle cells) fibrin (of blood clot), keratin (of nails and hair), and collagen (in connective tissues of skin, bones, ligaments etc.).

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