B1.3

Question 1

What is your metabolic rate

Answer 1

The speed at which chemical reactions in your cells transfer energy from chemical stores in food.

Question 2

What enzyme breaks down carbohydrates

Answer 2

Carbohydrase

Question 3

What enzyme breaks down starch

Answer 3

Amylase

Question 4

What enzyme breaks down protein

Answer 4

Protease

Question 5

What are lipids?

Answer 5

The fats and oils you eat

They are synthesised from 3 fatty acid molecules and a glycerol molecule

Question 6

Equation for aerobic respiration

Answer 6

Glucose + oxygen = carbon dioxide + water

C6H12O6+ 6O2 = 6CO2 + 6H2O

Question 7

How is the ATP produced during respiration used?

Answer 7

• to synthesise larger molecules from smaller ones to make new cell material.
• for movement p- animals use ATP to contract muscle cells enabling the organism to move
• to stay warm- when an animals surroundings are colder then they are, they increase their rate of respiration. This transfers more energy by heating so that they can keep their body at a constant temperature.

Question 8

Is respiration endothermic or exothermic

Answer 8

It is an exothermic reaction as energy is transferred to the surroundings by heating.

Question 9

Word equation for anaerobic respiration

Answer 9

Glucose —> lactic acid

Question 10

Why do you normally respire aerobically?

Answer 10

Aerobic respiration produces more atp molecules per glucose molecule. It has a greater yield. This is because the glucose molecule is fully broken down.

Question 11

Fermentation equation

Answer 11

Glucose —> ethanol + carbon dioxide

C6H12O6 —> 2C2H5OH + 2CO2