Year 12 Biological Molecules Flashcards Preview

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Flashcards in Year 12 Biological Molecules Deck (57)
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1

Name the bond that joins two monosaccharides.

Glycosidic

2

Name the disaccharide formed when two glucose molecules are joined.

Maltose

3

Name the type of reaction used to join monosaccharides together.

Condensation reaction

4

Name the carbohydrate formed when glucose and fructose are joined together.

Sucrose

5

Name the sugar made when galactose and glucose condense

Lactose

6

Name three monosaccharides

Glucose, fructose and galactose

7

Name 2 polysaccharides

Starch, glycogen and cellulose

8

Which elements are found in carbohydrates?

Carbon, hydrogen and oxygen.

9

Name the 2 molecules made when 2 glucose molecules are joined by a glycosidic bond

Maltose and water

10

Which type of glucose is used to make starch?

Alpha glucose

11

Which type of glucose is used to make cellulose?

Beta glucose

12

Give three uses of phosphate in living organisms.

Makes phospholipids, ATP, DNA, RNA

13

Name the three different molecules found in ATP

Ribose, adenine and phosphate

14

Why is iron needed in living things

Used to make haemoglobin which transports oxygen round the body.

15

Name the building blocks of triglycerides.

Glycerol and fatty acids.

16

What is the difference between a saturated and unsaturated fatty acid?

Saturated fatty acids have single carbon bonds between the carbon atoms.
Unsaturated fatty acids have at least one carbon clarion double bond.

17

How do you test for a lipid?

Add ethanol to the test solution.
Mix gently
Pour liquid into cold water

18

What is a positive and negative result for a biochemical test for lipid

Positive - White emulsion
Negative - clear

19

Name the elements found in lipids

Carbon, hydrogen and oxygen.

20

How many carbon atoms are found in glycerol

3

21

Name the bond formed when a fatty acid and glycerol join.

Ester bond

22

Name the type of reaction used to join fatty acids and glycerol

Condensation reaction

23

Name the type of reaction used when lipid is digested.

Hydrolysis

24

Describe how to test for starch

Add iodine to the test solution

25

Describe the colour produced in a positive and negative test for starch.

Positive - blue or black
Negative- yellow, orange, brown

26

Describe how to test for a reducing sugar

Add Benedict's solution
Heat in a waterbath

27

What colour is produced by a positive Benedict's test?

Green, yellow, orange, brick red

28

What colour is a negative result for a reducing sugar?

blue

29

Name 3 reducing sugars

Glucose, fructose, galactose, maltose, lactose

30

Name a non-reducing sugar

Sucrose