Respiration

Question 1

Krebs Cycle?

Answer 1

• 2C AcetylCoA joins with 4C Oxaloacetate to form a 6C citrate molecule
• Citrate is then broken down in several steps to regenerate Oxaloacetate, producing two CO2 and hydrogen
• CO2 diffuses out of the cell and hydrogen is taken up by NAD or FAD
• One ATP is produced

Question 2

Electron transport chain?

Answer 2

• On the cristae, electrons being carried by NAD and FAD are transferred down the ETC
• Provides energy for H+ ions to move into the space between the membranes (by active transport)
• Protons pass back across the membrane by ATPase (diffusion) into the matrix
• Energy from moving protons combines ADP + Pi –> ATP
• Forms 32 ATP

Question 3

Where does the Krebs Cycle take place?

Answer 3

Matrix of mitochondria

Question 4

Where does the ETC take place?

Answer 4

Cristae and Matrix of mitochondria

Question 5

What is the result if anaerobic respiration in plants and microorganisms?

Answer 5

Ethanol + CO2 + NAD

Question 6

Process of Glycolysis?

Answer 6

• Takes place in cytoplasm
• Begins with the activation of glucose, which joins with Pi from 2ATP to form phosphorylates glucose and 2ADP
• Phosphorylates glucose becomes two molecules of TP
• TP loses it’s hydrogen ions which is taken up by NAD, forming NADH
• TP is then converted into two pyruvate molecules

Question 7

Link reaction?

Answer 7

Pyruvate + NAD + CoA –> AcetylCoA + NADH + CO2