aerobic respiration

Question 1

stages of glycolysis

Answer 1

1. glucose is phosphorylated, 2ATP -> 2ADP
2. 6C compound spilts into 2 3C compounds
3. oxidation of triose phosphate to give pyruvate, loss of 2 H+ and 2 E- to NAD
4. phosphate added to ADP from intermediary compounds
5. net gain of 2 ATP

Question 2

where does glycolysis take place

Answer 2

cytoplasm of mitochondria

Question 3

what are coenzymes

Answer 3

small, organic, non protein molecules that carry chemical groups between enzymes, e.g NADP, NAD, FAD and Coenzyme A

Question 4

stages of the link reaction

Answer 4

1. pyruvate is decarboxylated to a 2C compound
2. NAD is reduced by collecting 2H+ ions and 2 e- from pyruvate
3. Coenzyme A combines with remaining 2C compound to form Acetyl CoA

Question 5

where does the link reaction take place

Answer 5

matrix

Question 6

krebs cycle

Answer 6

1. Acetyl CoA combines with a 4C compound to form a 6C compound
2. the 6C compound is decarboxylated to a 5C compound and produces CO2 and reduced NAD
3. the 5C compound is decarboxylated to a 4C compound and produces CO2, 2 reduced NAD, reduced FAD and ATP
4. cycle happens twice for each glucose molecule so products are timed by two

Question 7

how is ATP synthesised in oxidative phosphorylation

Answer 7

1. redox reactions take place as electrons pass along the ETC and release energy
2. this energy is used to add an inorganic phosphate to ADP to form ATP by ATP synthase or chemiosmosis

Question 8

role of oxygen in aerobic respiration

Answer 8

1. final acceptor of electrons in ETC
2. makes up water which is the safe end product
3. part of oxidative phosphorylation
4. oxygen allows oxidation of NADH2 so they can be regenerated and re-used

Question 9

where does krebs cycle take place

Answer 9

matrix

Question 10

where does ETC take place

Answer 10

cristae