Food.

Question 1

Why is food required?

Answer 1

Energy growth repair

Question 2

Name six common elements present in food.

Answer 2

Hydrogen
carbon
O xygen
Nitrogen
phosphorus
sulfer

Question 3

Name five trace elements present as a dissoIved salt.

Answer 3

Sodium
magnesium
calcium
Chlorine
Potassium

Question 4

What is a trace element?

Answer 4

an element only needed in small amounts
Zinc. Copper. Iron.

Question 5

What is a biomolecule?

Answer 5

Chemicals that are made inside a living thing

Question 6

Name the elements found in carbohydrates, proteins, lipids and vitamins

Answer 6

Carbon Oxygen Hydrogen.

Question 7

State the fixed ratio for elements present in carbohydrates

Answer 7

twice as much hydrogen as oxygen Cx ( H 20 ) y

Question 8

State the sources of carbohydrates, proteins, vitamins and lipids

Answer 8

Carbohydrates: pasta, potatoes, fruits, sugar
Protien: eggs meat, fish
Vitamin C: fresh fruit
vitamin D:fish oils egg yolk
Lipids: oil

Question 9

State 3 types of carbohydrates and examples of each

Answer 9

Monosccharides; glucose and fructose
Diassacharide; moltose and sucrose
Polysaccharide; starch, cellulose and glycogen

Question 10

State the structural role of cellulose

Answer 10

Helps form the plant cell wall

Question 11

State the Metab4olic role of starch

Answer 11

Provides glucose for respiration

Question 12

What is the structural difference between triglycerides and phospholipiss

Answer 12

A fatty acid has been replaced by the phosphat e group

Question 13

State the structural role of phospholipids

Answer 13

Helps form the structure of on animal cell

Question 14

State the Metabolic role for lipids

Answer 14

Broken down to provide cnersy

Question 15

How are proteins composed of amino acids.

Answer 15

20 amino acids

Question 16

How many amino acids are present in peptides, poly peptides and a protien. ?

Answer 16

less than 20

Question 17

How many common amino acids are present in protiens ?

Answer 17

20

Question 18

what is the s structural role of the protein Keretin

Answer 18

found in hairr
found in miosin in the muscles

Question 19

What are the metabolic roles of the promens enzymes and hormones ?

Question 20

what is the difference between a fiberous and global or protien?

Question 21

what are two types of vitamin solubility ?

Question 22

Name one water soluble vitamin and give a function and a deficiency .

Answer 22

Vitamin c: soluable in water
scurvey

Question 23

Name one fat soluble one and give a function and a deficienty

Answer 23

Vitamin D: soluble in fat
Rickets

Question 24

State the source and use of 2 plant Minerals

Answer 24

Calcium: salts absorbed from soil>helps bind cell walls together
Magnesium: salts absorbed from soil>Forms part of the structure of chlorophyll

Question 25

State the source and use of two animal minerals.

Answer 25

Calcium: Milk and cheese> forms strong bones Iron: liver and meat > forms part of the structure of haemoglobin

Question 26

3 reasons why water is essential for living things

Answer 26

Good solvent Helps regulate body temperature Provides a basis for transport systems in organisms Takes part in chemical reactions

Question 27

How much human body mass is made of water?

Answer 27

70%

Question 28

what is on anabolic reaction, give an example

Answer 28

Converting smaller molecules to bigger ones Eg photosynthesis

Question 29

what is a catabolic reaction, give an example

Answer 29

Breaking down larger molecules into smaller molecules Eg. Respiration and digestion

Question 30

State the chemicals used for the test for protiens, results and Colours

Answer 30

Biurets test Changes from. Blue to. Purple if protein is present

Question 31

state the chemicals used for test for lipids , results and colours.

Answer 31

If pe

Question 32

- St ate the chemicals used for reducing sugar and starch

Question 33

State colour for each food test.