respiration

Question 1

where does glycolysis occur

Answer 1

in the cytoplasm

Question 2

describe the process of glycolysis

Answer 2

-phosphorylation
of glucose to glucose phosphate
using Pi from 2 ATP

-hydrolysed to 2 x TP
- 2 x TP oxidised to 2 x pyuvate
2 NAD reduced
4 ATP regenerated
overall 2 ATP produced

Question 3

what happens after glycolysis if no 02

Answer 3

• pyruvate converted to lactate/ ethanol
• oxdising NADH so NAD regenerated
• so gylcolysis can continue

Question 4

describe what happens after glycolysis is o2 present

Answer 4

• pyruvate actively transported into mitochondrial matrix

- stages of anaerobic respiration

Question 5

where does the link reaction occur

Answer 5

in the mitochondrial matrix

Question 6

describe the link reaction

Answer 6

pyruvate - oxidised + decarboxylated
acetate formed
CO2 + NADH formed
coenzyme A + acetate = Acetyl coenzyme A

Question 7

products of link reaction per glucose molecules

Answer 7

2 x acetyl coenzyme A
2 x co2
2 x NADH

Question 8

where does the krebs cycle take place

Answer 8

in the mitochondrial matrix

Question 9

describe the process of the krebs cycle

Answer 9

Acetyl coenzyme A reacts with a 4-carbon molecule (oxaloacetate),
producing a 6-carbon molecule (citrate) that enters the Krebs cycle

• Coenzyme A released

• 6C molecule 5C 4C molecule (4C molecule regenerated) through a series of
oxidation-reduction reactions…

• Decarboxylation and dehydrogenation
• CO2 removed

• Coenzymes NAD & FAD reduced (key point – important for oxidative
phosphorylation)

• ATP produced by substrate level phosphorylation (direct transfer of Pi
from intermediate compound to ADP)