8.3 structure and hydrolysis of ATP Flashcards
1
Q
adenosine triphosphate
A
ATP
2
Q
structure of ATP
A
- sugar ribose
- adenosine (nitrogenous base)
- chain of 3 phosphate groups
3
Q
how do you break ATP bonds
A
hydrolysis
4
Q
ATP breakup:
A
terminal phosphate is broken off through hydrolysis
- leaving ADP + Pi
- exergonic
- produces 7.3kcal energy per mole of ATP hydrolyzed
5
Q
how much energy is produced in ATP breakup
A
-produces 7.3kcal energy per mole of ATP hydrolyzed
6
Q
why does ATP produce so much energy
A
- its like a compressed spring
- all 3 phosphate groups are (-)
- when they are crowded together, their negativity makes it unstable
7
Q
how to couple with ATP to make exergonic reactions
A
- if the change of G in the endergonic chemical reaction,
- is less than the amount of energy released in ATP hydrolysis,
- then when they are coupled, it is exergonic
8
Q
how does ATP coupling work
A
- ATP hydrolyzed into ADP
- Pi attaches to a reactant (phosphorylates it)
- makes it less stable
- so when it reacts with another reactant, the Pi is displaces and the 2 reactants join together
9
Q
transport and ATP
A
ATP phosphorylates a molecule and changes the way it binds to another molecule
10
Q
mechanical and ATP
A
ATP binds to motor protein
- ATP is hydrolyzed releasing ADP and Pi
- another ATP molecule binds
-at each stage, the motor proteins changes shape and ability to bind to cytoskeleton, moving the protein along the track
