1.6: ATP

Question 1

what type of reaction is ATP hydrolysis? exergonic or endergonic

Answer 1

exergonic

Question 2

what type of reaction is ATP synthesis? exergonic or endergonic

Answer 2

endergonic

Question 3

What is ATP hydrolysis catalysed by

Answer 3

ATP hydrolase

Question 4

What is ATP synthesis catalysed by

Answer 4

ATP synthase

Question 5

What is formed from ATP hydrolysis

Answer 5

ADP + Pi (inorganic phosphate)

Question 6

What is used for ATP synthesis

Answer 6

ADP + Pi (inorganic phosphate)

Question 7

What is the role of ATP

Answer 7

energy donor molecule, immediate energy source, universal ( all reactions in all cells in all organisms) energy carrier molecule

Question 8

List 6 advantages of ATP over glucose

Answer 8

1 - only one enzyme needed to hydrolyse ATP
2 - releases energy in usable quantities
3 - can be easily transported across organelle membranes not cell membranes, so needs to be synthesised in the cell that needs it - mitochondria
4 - water soluble
5 - doesn’t need to be stored
6 - easily recycled to ADP

Question 9

Describe the process of ATP recycling

Answer 9

ATP synthesis and ATP hydrolysis occur simultaneously, where something is transferred from one reaction to the other. During respiration, energy comes in and ATP synthesis occurs. At the same time, during muscle contraction, the ATP is used for muscle contraction and ATP hydrolysis occurs

Question 10

how does ATP carry out its role in a cell

Answer 10

the bond between the second and third phosphate group is hydrolysed by ATP hydrolase, releasing energy