Respiration (whole)

Question 1

Name the four stages involved in aerobic respiration and where they occur

Answer 1

Glycolysis (cytoplasm)
Link Reaction (mitochondrial matrix)
Krebs Cycle (mitochondrial matrix)
Oxidative phosphorylation (membrane of cristae)

Question 2

What is the electron transfer chain?

Answer 2

A series of carrier proteins embedded in the membrane of the cristae of mitochondria

Question 3

How is a proton concentration gradient established during chemiosmosis in aerobic respiration

Answer 3

Some energy released form the electron transfer chain is coupled to the active transport of protons to the inter membrane space

Question 4

What is the benefit of an electron transfer chain rather than a single reaction?

Answer 4

This allows energy to be released gradually, so less energy is released as heat

Question 5

What is the role oxygen in aerobic respiration?

Answer 5

Oxygen acts as a final electron acceptor in the electron transfer chain, producing water as a byproduct

Question 6

Name two types of molecule that can be used as alternative respiratory substrates?

Answer 6

Amino acids from proteins

Glycerol and fatty acids from lipids

Question 7

Name the stages in respiration that produce ATP by substrate level phosphorylation?

Answer 7

Glycolysis (anaerobically)

Krebs cycle (aerobically)