3 Food

Question 1

14 Elements in Food

Answer 1

Carbon
Hydrogen
Oxygen
Nitrogen
Phosphorus
Sulphur
Sodium
Chlorine
Magnesium
Potassium
Calcium
Iron
Copper
Zinc

Question 2

What are bionolecules

Answer 2

Chemicals that are made inside a living things

Question 3

Biomolecules of food

Answer 3

Carbohydrates
Proteins
Lipids
Vitamins

Question 4

Elements in Carbohydrates

Answer 4

(C) Carbon (H) Hydrogen (O) Oxygen

Question 5

Elements in Lipids

Answer 5

(C) Carbon (H) Hydrogen (O) Oxygen

Question 6

Elements in Proteins

Answer 6

(C) Carbon (H) Hydrogen (O) Oxygen (N) Nitrogen

Question 7

3 Types of Carbohydrates

Answer 7

Monosaccharides
Disaccharides
Polysacchraides

Question 8

Monosaccharide and example

Answer 8

Made from 1 sugar unit
Soluble in water
E.g Glucose, Fructose

Question 9

Disaccharides and example

Answer 9

Made up of 2 sugar units
Soluble in water
E.g Maltose,sucrose

Question 10

Polysaccharides and example

Answer 10

Made from many sugar units
Slightly soluble in water
Not sweet tasting
E.g Starch, Cellulose, Glycogen

Question 11

Metabolic functions of carbs

Answer 11

•Glucose:provides energy during respiration.
•Starch:energy storage molecule in plants
•Glycogen:energy storage molecule in animals

Question 12

Define metabolism

Answer 12

The sum of all chemical reactions in an organism. E.g Respiration

Question 13

Define biomolecules

Answer 13

Biomolecules are chemicals made inside living things

Question 14

Structural function of Carbohydrates

Answer 14

Cellulose:found in plant cell walls

Question 15

Structure of lipid/triglyceride

Answer 15

1 Glycerol
Linked to 3 fatty acids

Question 16

Structure of Phospholipid

Answer 16

Lipids with 1 glycerol linked to 2 fatty acids and 1 phosphate group.
*Found in all membranes

Question 17

Metabolic Function of lipid

Answer 17

Broken down in respiration to release energy

Question 18

Structural function of lipid

Answer 18

Food/energy stores in plants and animals
Heat insulation(fat under the skin) and protection of organs
Combine with phosphorus to make phospholipids
Combine with protein to form lipoproteins

Question 19

Water soluble vitamins

Answer 19

B and C

Question 20

Fat soluble vitamins

Answer 20

A D E and K

Question 21

Vitamin C

Answer 21

Keeps gums healthy
Deficiency leads to scurvy
Citrus fruits and boiled potatoes

Question 22

Vitamin D

Answer 22

Helps form strong bones and teeth
Deficiency=rickets/osteomalacia in adults
Dairy products and sunlight

Question 23

Amino acids

Answer 23

Basic sub units of a protein. There are 20 different types

Question 24

Structure of protein

Answer 24

Amino acids
Peptides <20 amino acids
Polypeptide >20 amino acids
Protein >200 amino acids

Question 25

2 Types of protein

Answer 25

Fiborous Globular

Question 26

Fiborous

Answer 26

Shows no folding, has a structural function. E.g Keratin in hair

Question 27

Globular

Answer 27

Shows lots of folding,has a metabolic function E.g Enzymes, hormones,antibodies

Question 28

Whats starch stored by

Answer 28

Starch is the carbohydrate stored by plants. Easily digested as glucose molecules are arranged in a chain and break easily

Question 29

Name a structural role of carbohydrates

Answer 29

Cellulose is used to form plant walls