Biological Molecules

Question 1

chemical elements present in carbohydrate

Answer 1

carbon, oxygen, hydrogen

Question 2

chemical elements present in protein

Answer 2

carbon, oxygen, hydrogen, nitrogen

Question 3

chemical elements present in fats

Answer 3

carbon, hydrogen, oxygen

Question 4

function of protein

Answer 4

building and repairing cells

Question 5

function of carbohydrate

Answer 5

provides instant energy

Question 6

function of fats

Answer 6

store energy and keep warm

Question 7

where is protein digested

Answer 7

mouth, stomach, and small intestine

Question 8

where is carbohydrate digested

Answer 8

small intestine

Question 9

where is fat digested

Answer 9

stomach

Question 10

examples of carbohydrates

Answer 10

bread, pasta

Question 11

examples of protein

Answer 11

meat, egg, fish

Question 12

examples of fat

Answer 12

butter, cooking oil

Question 13

how to test for starch

Answer 13

use iodine solution. positive = orange-brown to blue-black

Question 14

how to test for glucose

Answer 14

use benedicts solution. positive test = blue to orange or brick red

Question 15

how to test for protein

Answer 15

this is the biuret test. use copper sulphate and sodium hydroxide. positive = blue to violet / purple

Question 16

how to test for fat

Answer 16

use ethanol and water. positive = cloudy