Biological molecules

Question 1

What are the reducing sugars?

Answer 1

glucose, galactose, fructose, maltose, lactose

Question 2

What is the procedure for Benedict’s test?

Answer 2

If presented with a solid sample, grind with a mortar and pistol then add distilled water.
1) Add 2cm cube of Benedict’s solution to 2cm cube of the liquid/ aqueous sample.
2) Heat the mixture for 5 minutes in a boiling water bath.

Question 3

What is the procedure for iodine test?

Answer 3

Iodine solution can be used on solid and liquid samples
1) Add 3 to 5 drops of iodine solution to the sample

Question 3

What is the procedure for the ethanol- emulsion test?

Answer 3

1) Add the food sample to a beaker of ethanol and shake thoroughly to allow any fats present to dissolve
2) Filter the mixture and pour 2cm cube of the residue to 2cm cube of water

Question 4

What is the element composition of proteins?

Answer 4

Carbon, hydrogen, oxygen and nitrogen

Question 5

What is the procedure for Biuret test?

Answer 5

1) Add 2cm cube of sodium hydroxide solution to

Question 6

What are enzymes?

Answer 6

Enzymes are biological catalysts that speed up the rate of chemical reactions.