B4 - Biological Molecules

Question 1

Chemical elements that make up carbohydrates

Answer 1

Carbon, oxygen and hydrogen

Question 2

Chemical elements that make up protein

Answer 2

Carbon, hydrogen, oxygen and nitrogen

Question 3

Chemical elements that make up fats

Answer 3

Carbon, hydrogen and oxygen

Question 4

What are the larger molecules made from glucose

Answer 4

Starch, glycogen, and cellulose

Question 5

What are proteins made from

Answer 5

Amino acids

Question 6

What are fats and oils made up of

Answer 6

Fatty acids and glycerol

Question 7

What does iodine solution test for

Answer 7

Starch

Question 8

What does Benedict’s solution test for?

Answer 8

Reducing sugars

Question 9

What does the biuret test for

Answer 9

Protein

Question 10

What does the ethanol emulsion test for

Answer 10

Fats and oils

Question 11

How many different amino acids are there

Answer 11

20

Question 12

What is a) one sugar called b) two sugars c) many sugars

Answer 12

A) monosaccharide b) disaccharide c) polysaccharide

Question 13

What is the colour of a negative iodine test

Answer 13

Orange brown

Question 14

What is the colour of a positive iodine test

Answer 14

Blue-black

Question 15

What is the colour of a negative biuret test

Answer 15

Blue

Question 16

What is the colour of a positive biuret test

Answer 16

Purple

Question 17

What is the colour of a negative ethanol emulsion test

Answer 17

Clear/colorless

Question 18

What is the colour of a positive ethanol emulsion test

Answer 18

Cloudy emulsion

Question 19

What is the colour of a negative Benedict’s solution test

Answer 19

Blue

Question 20

What is the colour of a Benedict’s solution test if there is a trace of a reducing sugar

Answer 20

Green / yellow

Question 21

What is the colour of a moderate amount of a reducing sugar in the Benedict’s solution test

Answer 21

Orange

Question 22

What is the colour of a high amount of a reducing sugar in a Benedict’s solution test

Answer 22

Brick red

Question 23

Name reducing sugars

Answer 23

Glucose, maltose, fructose and galactose

Question 24

Name monosaccharides

Answer 24

Fructose, galactose and glucose

Question 25

Give an example of a food containing starch

Answer 25

Rice, bread, potato, pasta, etc

Question 26

Give an example of a food containing protein

Answer 26

Meats, tofu, bacon, etc

Question 27

Name a food containing glucose

Answer 27

Apple, sugars, etc

Question 28

Give an example of foods with fats/lipids

Answer 28

Butter, cheese, egg yolk, chocolate