Nutrition & Food Tests

Question 1

Biological molecules

Answer 1

Give us energy.

Question 2

Carbohydrates

Answer 2

Provide energy.

2 types - Simple and Complex Carbs

Question 3

Carbohydrates and Fats

Answer 3

Made up of

• Carbon
• Hydrogen
• Oxygen

Question 4

Cellulose

Answer 4

Found in Plant Cell Walls.

Cannot be digested by humans.

However, as fibre - helps the muscles of intestinal wall to push food through the digestive system.

Question 5

Cellulose as Fibre

Answer 5

Helps the muscles of intestinal wall to push food through the digestive system.

Question 6

Cellulose, Starch and Glycogen

Answer 6

Long Chain of Sugars joined together.

Question 7

Fats/Lipids

Answer 7

A store of energy.

Provide Double the Energy that carbohydrates and proteins do.

Made up of fatty acids and glycerol.

Question 8

Food

Answer 8

Made up of different biological molecules;
- Which Give us Energy

Contain chemicals we need to:

• Grow and Repair ourselves
• Help our Cells Function

Question 10

Glucose

Answer 10

Can be used by cells to make energy.

Question 11

Proteins

Answer 11

Used for the growth and repair of cells
- Used as a source of energy
if carbohydrate and fat reserves are low.

Made up of long chains of amino acids
- which after digestion; are absorbed into the bloodstream

• and brought to cells that reassemble them into proteins needed by the body.

Question 12

Glycogen

Answer 12

Carbohydrate stored within the liver and skeletal muscle

A Polysaccharide that can be Converted into Glucose when Levels Low.

Question 13

Reagent

Answer 13

Chemical that indicates the presence of a substance, usually by changing colour.

Question 17

Proteins contain

Answer 17

• Carbon
• Hydrogen
• Oxygen
• Nitrogen

Question 18

Starch

Answer 18

Broken down by digestive enzymes into glucose - which can be used by cells to make energy.

Question 19

Reagents and Food Testing

Answer 19

There are tests which can be used to detect carbohydrates, proteins and lipids.

They involve:
- Adding a reagent to a food sample - changing the colour depending on what biological molecules are present.

• Sometimes it‘s necessary to crush or add water to the food before adding the reagent.

Question 20

Initial Colour of Benedicts (Reagent)

Answer 20

Blue

Question 21

Initial Colour of Biuret (Reagent)

Answer 21

Blue

Question 22

Initial Colour of Ethanol (Reagent)

Answer 22

Colourless

Question 23

Simple Carbohydrates

Answer 23

Sugars - Glucose and Lactose

Fast Acting Source of Energy.

Question 23

Complex Carbohydrates

Answer 23

Include - Cellulose, Starch and Glycogen

Source of Slow Releasing.

Question 23

Complex Carbohydrates Examples

Answer 23

Rice and pasta.

Question 25

Initial Colour of Iodine (Reagent)

Answer 25

Yellow-brown

Question 26

Simple Carbohydrates Examples

Answer 26

Biscuits + energy bars.

Question 28

Biuret (Reagent)

Answer 28

Mixture of Sodium Hydroxide and Copper Sulfate.

Question 29

Benedict colour - Positive result for Reducing Sugar

Answer 29

Brick red precipitate

Question 30

Biuret colour - Positive result for Protein/Amino Acid

Answer 30

Lilac/purple

Question 31

Ethanol colour - Positive result for Fat

Answer 31

White Emulsion

Question 32

Testing for Protein/Amino Acids

Answer 32

Reagent - Biuret Method: add Biuret fo the food. Initial Colour - Blue. Colour of Positive Result - Lilac/purple.

Question 33

Testing for Fat

Answer 33

Reagent - Ethanol. Method: add Ethanol to the food to dissolve the fat then add water. Initial Colour - Colourless. Colour of Positive Result - White Emulsion.

Question 34

Iodine colour of positive result for Starch

Answer 34

Blue-black

Question 35

Testing for Reduced Sugar

Answer 35

Reagent used - Benedicts Method: add Benedicts to the food and boil in a water bath. Initial colour - Blue. Colour of a positive result - Brick red precipitate.

Question 36

Testing for Starch

Answer 36

Reagent - Iodine. Method: add Iodine to the food. Initial colour - Yellow-brown. Colour of Positive Result - Blue-black.

Question 37

The Chemicals in Our Food Are Needed to

Answer 37

- Grow and Repair Ourselves | - Help Our Cells Function

Question 37

Contain Chemicals We Need To: - Grow and Repair Ourselves - Help Our Cells Function

Answer 37

Food in our diet.

Question 39

In Our Food and Give Us Energy

Answer 39

Biological Molecules

Question 39

Proteins needed by the body

Answer 39

Enzymes

Question 40

Essential to Grow and Repair Ourselves + Help Our Cells Function

Answer 40

Chemicals in our Food.

Question 41

Adding what to a food sample - changes the colour depending on what biological molecules are present

Answer 41

A reagent.

Question 42

Food Sample Examples

Answer 42

- Reducing Sugar - Starch - Protein/Amino Acids - Fat

Question 45

Cannot be digested by humans

Answer 45

Cellulose

Question 46

Sometimes what is necessary before adding the reagent into food

Answer 46

To crush or add water to the food.

Question 47

Whilst testing for Reducing Sugar: | After adding Benedicts (Reagent) to the food

Answer 47

Boil in a water bath.

Question 48

Adding a reagent to ? - changes the colour depending on what biological molecules are present.

Answer 48

Food

Question 49

During tests to detect carbohydrates, proteins and lipids; | Adding a reagent to a food sample - changes the colour depending on what ? are present.

Answer 49

Biological Molecules

Question 51

Foods high in Fat

Answer 51

- Cheese - Butter - Oils

Question 51

Sometimes it‘s necessary to crush or add water to the food before adding what?

Answer 51

The reagent.

Question 52

Sometimes it is necessary to crush or add water to what before adding the reagent?

Answer 52

Food

Question 53

Used as a source of energy if Carbohydrate and Fat reserves are low

Answer 53

Proteins

Question 54

Whilst testing for Fat: | We add Ethanol to the food to dissolve ? then add water.

Answer 54

Fat

Question 55

Examples of Reducing Sugar

Answer 55

- Glucose - Fructose - Galactose

Question 56

Whilst testing for Fat: we add Ethanol to the food to dissolve the fat then add ?

Answer 56

Water

Question 57

Foods high in protein

Answer 57

Fish and eggs.

Question 58

What is made of biological molecules?

Answer 58

Food (our diet)

Question 58

Found in Plant Cell Wall

Answer 58

Cellulose

Question 58

What are absorbed into the bloodstream after digestion?

Answer 58

Amino acids

Question 58

What are reassembled into proteins in the bloodstream?

Answer 58

Amino acids

Question 58

When are amino acids absorbed into the bloodstream?

Answer 58

After digestion.

Question 58

Tests used to detect carbohydrates, proteins and lipids

Answer 58

Involve: - Adding a reagent to a food sample - changing the colour depending on what biological molecules are present. - Sometimes it‘s necessary to crush or add water to the food before adding the reagent.

Question 59

Controlled Variables

Answer 59

A factor kept the same during an experiment in order to keep the experiment valid.