Importance of ATP

Question 1

Synth in mitochondria process part 1

Answer 1

Energy released in ETS used to pump protons (H+) from mitochondrial matrix into a compartment between the inner and outer mitochondrial membranes.

Question 2

Synth in mitochondria process part 2

Answer 2

The protons accumulate so that a steep conc grad develops between the compartment and the matrix.

Question 3

Synth in mitochondria process part 3

Answer 3

Inner membrane is impermeable to protons so they diffuse back into the matrix via chemiosmotic channels through the stalked particle.

Question 4

Synth in mitochondria process part 4

Answer 4

Energy associated w/ the proton movement through the particle drives ATP synth. Phosphorylation of ADP is catalysed by ATP synthase in the bulbous end of the stalked particle.

Question 5

Synth in photosynthesis part 1

Answer 5

Proton pump across thylakoid membrane driven by energy from excited electrons as they pass through ETS.

Question 6

Synth in photosynthesis part 2

Answer 6

Protons accumulate in thylakoid compartment, forming a conc grad.

Question 7

Synth in photosynthesis part 3

Answer 7

They diffuse back into stroma through chemiosmotic channels which are formed by ATP synthase enzyme complex. As they pass through, the enzyme complex convs ADP and Pi into ATP.