Nutrition & Food tests

Question 1

A balanced diet contains all 7 essential components in the correct proprotion

Answer 1

Protein
Fats
Carbohydrates
Vitamins
Minerals
Fibre
Water

Question 2

what is malnourished

Answer 2

if a diet contains too much or too little of any of the 7 essential components.

Question 3

Benedicts Initial colour and end colour for positive

Answer 3

Blue
Brick Red PRECIPITATE

Question 4

Iodine Initial colour and end colour for positive

Answer 4

Yellow - Brown
Blue - Black

Question 5

Biuret Initial colour and end colour for positive

Answer 5

Blue
Lilac / Purple

Question 6

Ethanol Initial colour and end colour for positive

Answer 6

Colourless
White EMULSION

Question 7

Fat Test

Answer 7

Make a suspension of the food
add clear ethanol
mix/shake
observer
a white emulsion will form if fat is present

Question 8

Reducing Sugar Test

Answer 8

Crush/crumble the food sample
Add blue benedicts solution
Boil/heat in a water bath
A brick red precipitate will form if sugar is present (different colour indicates less sugar)

Question 9

Starch Test

Answer 9

Add a few drops of yellow/brown iodine solution
A blue/black colour will form if starch present

Question 10

Protein Test

Answer 10

Dissolve some food in water
Add some blue biuret solution
A lilac purple colour will form if protein is present

Question 11

What are simple carbohydrates and examples

Answer 11

Are broken down quickly by the body to be used as energy. Sweet and soluble.

Glucose
Lactose

Question 12

What are complex carbohydrates and examples.

Answer 12

Are broken down slowly by the body and are therefor a good store of energy

Cellulose
Starch
Glycogen

Question 13

What is glucose function and sources

Answer 13

Provide energy rapidly

Sources
Sweets, biscuits, cakes, jam and fizzy drinks

Question 14

function and sources of lactose

Answer 14

Provide energy rapidly

Milk - Including breast milk

Question 15

function and sources cellulose + structure

Answer 15

Helps the muscles of the intestine wall push food along

Fond in plant cell walls

made up of straight chains of glucose molecules held together with hydrogen bonds. this gives it a high strength

Question 16

function and sources of starch (complex) + structure

Answer 16

energy storage in plant cells

Bread rice potatoes and pasta

composed of branched chains of

Question 17

function and sources of starch (non complex)

Answer 17

slow release energy

Structure = glucose molecules

Question 18

function and sources glycogen + structure

Answer 18

Energy storage in animal cells -

all animal material especially red meat

Composed of highly branched chains of glucose molecules

Question 19

Proteins contain what elements

Answer 19

C H O N and sometimes S