Respiration

Question 1

Why is ATP described as universal energy currency?

Answer 1

• it’s used a source of energy in all cells in all chemical reactions
• provides energy released as ‘ small packets ‘

Question 2

Define respiration?

Answer 2

• enzyme controlled reaction

* releases energy in form of ATP from oxidation of organic molecules e.g glucose

Question 3

Advantages of ATP?

Answer 3

• easily transported in membrane
• 1 enzyme needed to release energy from ATP
• easily hydrolysed
• releases energy in small amounts when/where needed
• hydrolysis of ATP to ADP involves single reaction that releases energy immediately

Question 4

How does ATP carry energy?

Answer 4

• atp is synthesised from adenosine diphosphate (ADP) & an inorganic phosphate using energy broken down by glucose
• atp moves to part of cell that requires energy
• then broken down to ADP and inorganic phosphate (Pi) & releases energy for process to use
• The ADP and phosphate are recycled and process starts again

Question 5

What would happen if the release of energy from glucose was uncontrolled?

Answer 5

• increase in temperature which would destroy cells

Question 6

What is the function of the Krebs Cycle?

Answer 6

• liberates energy from carbon bonds to make ATP, NADH and FADH2

Question 7

What do the reduced NAD and FAD do in the Krebs Cycle?

Answer 7

• deliver hydrogen to the electron transport system in the inner mitochondrial membrane