steroids, lipoproteins, waxes,

Q.        What    are steroids?

Ans:    Steroids are lipids which contain four fused carbon rings

that form the steroid nucleus,

cyclopentanoperhydrophenanthrene.

Q.        What    are lipoproteins?

Ans:    These  are complexes of protein    and              lipids      held together

by non-covalent bonds, for example plasma.

Q.        Give two structural aspects of fatty acids?

Ans: (i)           Non polarity

(ii)        Geometrical Isomerism

Q. What is distinguishing factor found in naturl fatty acids?

Ans:    Most of them has cis-configuration.

Q.        What are waxes?

Ans:    Waxes are esters of fatty acid with monohydric alcohols

of high molecular weight e.g., sperm oil, candles etc.

Q.        Give biological function of waxes?

Ans: . Their major biological role is to serve as protective chemical coating on surface of animals and plants.

Q.        How any body gets lipids?

Ans:    Main source of lipids is diet (exogenous lipids) including

fats and oils, obtained from animals and oil seeds while endogenous sources of lipids are degradation products of proteins and carbohydrates.

Q. Which is main enzyme helping in digestion of lipids?

Ans:    Lipase.