Respiration: Step 2/3- link reaction and krebs cycle

Question 1

Where does this take place?

Answer 1

= in the matrix of the mitochondria

Question 2

What happens first?

Answer 2

= pryuvate is activley transported with the use of ATP and NADH from the cytoplasm into the mitochondrial matrix
= by carrier proteins in the mitochondrial membrane
=

Question 3

What happens in link reaction?

Answer 3

= the pyruvate made in glycolosis is oxidised to acetate
= oxidation means to loose a hydrogen, this forms a 2C molecule, and NAD is reduced picking up the hydrogen
= this releases carbon dioxide (1C)
= acetate combindes with co-enzyme A to produce acetyl co enzyme A (2C)
= so it can enter krebs cycle
=

Question 4

What is the products of the link reaction?

Answer 4

= 2 acetyl co-enzyme A
= carbon dioxide
= reduced co-enzyme
= reduced NAD
= this happens twice for one glucose molecule as there is 2 pryuvate molecile

Question 5

What happens in krebs cycle?

Answer 5

= acetyl-coenzyme-A reacts with a 4 carbon compound, releasing co-enzyme A and producing a 6 carbon molecule
= this enters co-enzyme A
= series of redox reactions - produces reduced NAD AND FAD and ATP by substrate level phosphorlyation and carbon dioxide is lost

= six carbon molecule looses 2 carbons to form 2 carbon dioxide molecules and a 4 carbom molecule
= produces ATP
= NAD is reduced 3 times
= FAD is reduced once

Question 6

How many are produced per glucose?

Answer 6

= 6 reduced NAD
= 2 FAD
= 2 ATP
= 4 carbon dioxide

Question 7

What are the products per cycle?

Answer 7

= 3 reduced NAD
= 1 reduced FAD
= 1 atp
= 2 carbon dioxide