Respiration

Question 1

How can we measure how much energy is in food?

Answer 1

Calorimeter or burning food under a test tube of water and calculate rise in temperature

Question 2

What is some drawbacks in doing the setting on fie food experiment?

Answer 2

Not all heat energy from the burning food goes into the water. Some heats the test tube or goes into the air
Not all food is burned

Question 3

What is respiration?

Answer 3

The process of releasing energy from food

Question 4

How can you summarise aerobic respiration in a word equation?

Answer 4

glucose+oxygen —-> carbon dioxide+water+energy

Question 5

What is the structure of ATP

Answer 5

1 adenosine group joined to 3 phopshate (pi)

Question 6

What is ATP

Answer 6

a form of energy storage that can be released when needed

Question 7

Examples of activities requiring ATP

Answer 7

cell division, muscle cell contraction, protein synthesis and transmission of nerve impluses

Question 8

Describe aerobic respiration

Answer 8

starts in cytoplasm, glycolysis occurs (glucose broken down into 2 pyruvate) enzyme controlled reaction and 2 ATP made.
Mitochondira, enzyme controlled reaction break down pyruvate into carbon dioxide and water and makes lots of ATP

Question 9

Fermentation in animal cells

Answer 9

Cytoplasm, glycolysis makes 2 pyruvate and 2 ATP. Pyruvate turns into lactate which can be turned back into pyruvate when oxygen is available

Question 10

Fermentation in plants and mircrobes

Answer 10

Glycolysis, pyruvate turns into ethanol and carbon dioxide