B3 Biological Molecules

Question 1

Chemical elements that make up carbohydrates

Answer 1

Carbon, Hydrogen and Oxygen

Question 2

Chemical elements that make up fats

Answer 2

Carbon, Hydrogen and Oxygen

Question 3

Chemical elements that make up proteins

Answer 3

Carbon, Hydrogen, Oxygen and Nitrogen

Question 4

Smaller molecules from glucose

Answer 4

Starch and Glycogen

Question 5

Smaller molecules from proteins

Answer 5

Amino Acids

Question 6

Smaller molecules from fats and oils

Answer 6

Fatty acids and Glycerol

Question 7

Test for starch

Answer 7

Iodine solution

Question 8

Positive and negative test for starch

Answer 8

Negative - Iodine stays brown
Positive - Iodine turns blue/purple

Question 9

Test for reducing sugars

Answer 9

Benedicts solution

Question 10

Positive and negative test for reducing sugars

Answer 10

Negative - stays blue
Positive - turns brick red

Question 11

Test for proteins

Answer 11

Biuret Test

Question 12

Positive and negative test for proteins

Answer 12

Negative - Blue
Positive - Purple

Question 13

Test for fats and oils

Answer 13

Ethanol emulsion

Question 14

Positive and negative test for fats and oils

Answer 14

Negative - Ethanol stays clear
Positive - turns cloudy white