Respiration

Question 1

What happens to the Pyruvate in ANEROBIC CONDITIONS?

Answer 1

• Pyruvate is Converted into L-Lactate by accepting Hydrogen atoms from the NADH
• This is Catalysed by LDH (Lactate Dehydrogenase)
• This regenerates NAD+
• This allows for glycolysis to continue
• There is no oxygen to act as (final) hydrogen acceptor
• Therefore the Link reaction and Krebs Cycle cannot occur
• net ATP of 2

Question 2

Suggest how seals respire underwater for a long time?

Answer 2

• Lower metabolic rate
• High tolerance of CO2
• More NAD to accept (H)
• More pH buffers
• Blood is diverted to vital organs
• Lots of Haemoglobin to hold onto more oxygen molecules

Question 3

Where does Oxidative phosphorylation occur?

Answer 3

-inner membrane of the mitochondria (Cristae)

Question 4

What is the role of ATP in the cell?

Answer 4

• Energy Currency
• Universal energy molecule
• Immediate source of energy
• ATP hydrolysed into ADP releasing energy
• Small packets of energy to (prevent cell damage)