AQA GCSE Biology Trilogy: Food Tests

studied byStudied by 19 people
4.3(3)
get a hint
hint

Carbohydrates consist of…

1 / 29

30 Terms

1

Carbohydrates consist of…

  • Carbon

  • Hydrogen

  • Oxygen

New cards
2

Lipids consist of…

  • Carbon

  • Hydrogen

  • Oxygen

New cards
3

Proteins consist of…

  • Carbon

  • Hydrogen

  • Oxygen

  • Nitrogen

New cards
4

What are complex carbohydrates made of?

Long chains of simple single units

New cards
5

What is cellulose used for?

Cellulose is used for support in plants

New cards
6

Fats and oils are classed as…

Lipids

New cards
7

Which is the most efficient energy store?

Lipids

New cards
8

Are lipids soluble in water?

No

New cards
9

Which of these statements is true about lipids?

a. Made up of 3 molecules of glucose joined to 1 molecule of fatty acid

b. Made up of 3 molecules of fatty acids joined to 1 molecule of glycerol

c. Made up of 3 molecules of glycerol joined to 1 molecule of fatty acid

b. Made up of 3 molecules of fatty acids joined to 1 molecule of glucose

b. Made up of 3 molecules of fatty acids joined to 1 molecule of glycerol

New cards
10

What decided whether a lipid is a solid or a liquid?

Fatty acids

New cards
11

What are proteins used for?

  • Building cells

  • Building tissues

New cards
12

How much of the body is protein?

15 - 16%

New cards
13

What foods consist of high protein levels?

  • Meat

  • Fish

  • Pulses

  • Cheese

New cards
14

What consists of long chains of amino acids?

Proteins

New cards
15

What are protein bonds sensitive to?

  • pH

  • Temperature

New cards
16

Name the 2 tests for carbohydrates

  • Iodine test for starch

  • Benedict’s solution test for sugars

New cards
17

Describe the colour change of iodine in the presence of starch

Yellow / red iodine turns blue / black

New cards
18

Describe the colour change of iodine in the presence of proteins

No change

New cards
19

Describe the colour change of iodine in the presence of lipids

No change

New cards
20

Describe the colour change of Benedict’s solution in the presence of sugars

Blue Benedict’s solution turns brick red (when heated)

New cards
21

Describe the colour change of Benedict’s solution in the presence of lipids

No change

New cards
22

Describe the colour change of Benedict’s solution in the presence of proteins

No change

New cards
23

Name the solution used in testing for the presence of lipids

Ethanol

New cards
24

Describe the colour change of ethanol in the presence of lipids

Colourless ethanol turns cloudy white

New cards
25

Describe the colour change of ethanol in the presence of sugars

No change

New cards
26

Describe the colour change of ethanol in the presence of proteins

No change

New cards
27

Name the solution used in testing for the presence of proteins

Biuret reagent

New cards
28

Describe the colour change of Biuret reagent in the presence of proteins

Blue Biuret solution turns purple

New cards
29

Describe the colour change of Biuret reagent in the presence of lipids

No change

New cards
30

Describe the colour change of Biuret reagent in the presence of starch

No change

New cards

Explore top notes

note Note
studied byStudied by 144 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 5 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 93 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 12 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 52 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 8 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 3 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 12 people
Updated ... ago
5.0 Stars(1)

Explore top flashcards

flashcards Flashcard57 terms
studied byStudied by 3 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard22 terms
studied byStudied by 14 people
Updated ... ago
5.0 Stars(2)
flashcards Flashcard22 terms
studied byStudied by 43 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard51 terms
studied byStudied by 6 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard54 terms
studied byStudied by 34 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard47 terms
studied byStudied by 6 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard147 terms
studied byStudied by 6 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard312 terms
studied byStudied by 9671 people
Updated ... ago
3.8 Stars(164)