The almost pure cellulose obtained from the seed threads of Cossypium (cotton) i

Question

The almost pure cellulose obtained from the seed threads of Cossypium (cotton) is tough, fibrous, and completely insoluble in water. In contrast, glycogen obtained from muscle or liver disperses readily in hot water to make a turbid solution. Despite their markedly different physical properties, both substances are (1 rightarrow 4) linked D-glucose polymers of comparable molecular weight. What structural features of these two polysaccharides underlie their different physical properties? Explain the biological advantages of their respective properties What is an isozyme? Explain briefly with an example. The bacterium E. coli can grow at 20 degree C or at 40 degree C. At which growth temperature would you expect the membrane phospholipids to have a higher ratio of saturated to unsaturated fatty acids, and why? Show the structure of isoprene; explain what is meant by isoprenoid compounds and give an example.

Explanation / Answer

13. Isozyme = isozymes are enzyme that differ in the sequence of amino acids but catalyze the same chemical reaction.

example= glucokinase

14. Isoprene = CH2=CH(CH3)-CH=CH2

isoprenoid compounds are formed from isoprene unit and simplest isoprenoid compound are monoterpenoid.

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