Define carbohydrates.

Chapter 13

BIOCHEMISTRY                  

SOLVED TEST YOURSELFS

Test Yourself 13.1 (CARBOHYDRATES)

  1. No. i. Define carbohydrates.

Answer. Carbohydrates are defined as polyhydroxy aldehydes or ketenes. They have general formula Cn(H2O)n. They are macromolecules.

 

  1. No. ii. Give the characteristics of disaccharides.

Answer. Disaccharides give 2 units of monosaccharide’s on hydrolysis. These carbohydrates are white, crystalline solids and are easily soluble in water. They are also sweet in taste. They may be reducing or non-reducing in nature. The most important disaccharides is sucrose.

 

  1. No. iii. Give the balanced equation for the formation of glucose.

Answer. Glucose is formed from carbondioxcide and water through photosynthesis process. The balanced chemical equation, for formation of glucose is as follows:

6CO2   +   6H2O  sunlight  C6H12O6 +6O2

chlorophyll               

 

  1. No. iv. Draw the structure of glucose.

Answer. Glucose is a monosaccharide having formula C6H12O6 +6O2. It is pentahydroxy aldehyde consisting of six carbon atoms. Its structure is represented as:

 

CHO

H-C-OH

HO-C-H

h-c-oh

h-c-oh

CH2OH

Glucose

 

  1. No. v. Give the balanced equation for the hydrolysis of sucrose.

Answer. Sucrose is a disaccharide having formula C12H22O11. The balanced equation for the hydrolysis of sucrose is given below. It produces one unit of glucose and one unit of fructose.

C12H22O11  +  H2O  Dil.HCl       C6H12O6  + C6H12O6

heat        glucose    fructose

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