B3- Digestive System

Question 1

Catalyst

Answer 1

A substance that’s speeds up the rate if another reaction but is not used up or changed itself

Question 2

Enzyme

Answer 2

A biological catalyst

Question 3

Substrate

Answer 3

Molecule acted on by a catalyst

Question 4

Active site

Answer 4

The site on enzymes where the reactants bind

Question 5

Denature

Answer 5

Change the shape of the active site

Question 6

Metabolism

Answer 6

The sun of all reactions in a cell or the body

Question 7

Bile

Answer 7

Made in the liver and stored in the gall bladder

Question 8

Organisation of cells

Answer 8

Cell
Tissue
Organ
Organ system
Organism

Question 9

Stomach role in the digestive system

Answer 9

Makes acid and churns food

Question 10

Liver

Answer 10

Makes bile:
Neutralises acid
Emulsifies fats

Question 11

Large intestine

Answer 11

Absorbs water

Question 12

Small intestine

Answer 12

Absorbs nutrient

Question 13

Food test : starch

Answer 13

Iodine
Turns from orange to blue

Question 14

Food test: glucose

Answer 14

Benidict’s solution plus heat
Blue to red

Question 15

Food test: protein

Answer 15

Biuret solution
Blue to purple

Question 16

Food tests: lipids

Answer 16

Ethanol
White precipitate

Question 17

Emulsify

Answer 17

Break up into smaller droplets