Respiration

Question 1

four stages of aerobic respiration

Answer 1

• glycolysis
• link reaction
• krebs’ cycle
• oxidative phosphorylation

Question 1

what intermediates and product is formed in glycolysis?

Answer 1

glucose
–> hexose bisphosphate
–> G3P/TP
—> pyruvate

Question 2

what is used/made in glycolysis and where?

Answer 2

2ATP –> 2ADP + 2Pi
(conversion of glucose to hexose bisphosphate)

2NAD –> 2 red NAD
(one per molecule of TP converted to pyruvate)

4ADP + 4Pi –> 4ATP
(conversion of hexose bisphosphate to pyruvate)

Question 3

what is the product of the link reaction?

Answer 3

acetyl coenzymeA

Question 4

what is used/made in the link reaction per molecule of pyruvate?

Answer 4

CO2
(decarboxylation of pyruvate)

NAD –> red NAD

coenzyme A + 2C molecule –> acetyl coA

Question 5

three stages of the link reaction

Answer 5

• decarboxylation
• dehydrogenation
• combination

Question 6

where does glycolysis take place?

Answer 6

cytoplasm of the cell

Question 7

where does the link reaction take place?

Answer 7

mitochondrial matrix

Question 8

intermediates in the krebs’ cycle (and how many carbons are each of them)

Answer 8

• acetyl coA (2) + oxaloacetate (4)
  –> citrate (6)
  –> ketoglutarate (5)

Question 9

what is used/made in the Krebs’ cycle (and where)?

Answer 9

CO2
NAD –> red NAD
(conversion of citrate to ketoglutarate)

CO2
ADP + Pi –> ATP
FAD –> red FAD
2NAD –> 2 red NAD
(conversion of ketoglutarate to oxaloacetate)

Question 10

dehydrogenation

Answer 10

removal of H (usually to reduce NAD or FAD)

Question 11

coenzymes involved in respiration

Answer 11

• NAD (H carrier)
• FAD (H carrier)
• coenzyme A

Question 12

how much ATP does red NAD and red FAD produce in oxidative phosphorylation?

Answer 12

red NAD -> 2.5ATP
red FAD -> 1.5ATP