Q. 23

(a) Write the pro

Answer :

(a) D-glucose gets oxidised to six carbon carboxylic acid called gluconic acid on reaction with a mild oxidising agent like bromine water.

(b) Hydrogen bonding provides stability to - helix structure of protein.

A polypeptide chain forms all possible hydrogen bonds by twisting into a right handed screw (helix) with the –NH group of each amino acid residue hydrogen bonded to the C=O of an adjacent turn of the helix.

(c) Deficiency of vitamin B12 causes pernicious anaemia.


(a) Sucrose is dextrorotatory but after hydrolysis gives dextrorotatory glucose and laevorotatory fructose. Since the laevorotation of fructose (–92.4°) is more than dextrorotation of glucose (+52.5°), the mixture is laevorotatory. Thus, hydrolysis of sucrose brings about a change in the sign of rotation, from dextro (+) to laevo (–) and the product is named as invert sugar.

(b) Protein found in a biological system with a unique three dimensional structure and biological activity is called a native protein.

(c) When nucleoside is linked to phosphoric acid at 5′-position of sugar moiety, we get a nucleotide. It consists of phosphate, pentose sugar and nitrogenous base as shown in figure.

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