ETC

Question 1

How does the creation of coenzymes NADH and FADH2 link the CAC and ETC ?

Answer 1

They are electron rich and carry their electrons and hydrogen ions into the ETC

Question 2

Where do NADH and FADH2 pass their electrons to

Answer 2

They pass them to membrane bound electron carriers

Electron carrier complexes 1, 3 and 5

Question 3

Why do NADH and FADH2 pass their electrons to ETC complexes

Answer 3

This allows electrons to pass from the matrix (where CTC occurs) into the intermembrane space

Question 4

The ETC is

Answer 4

a series of biochemical reactions where electrons (e-) and hydrogens (H+) are passed to intermediate carriers

Finally accepted by 02 to produce H20

Question 5

What drives the ATP synthase (membrane bound)

Answer 5

H+ protons (energy) enter back through from the outer membrane space causing the mechanism on top to spin which drives the ATP synthase engine to spin causing ADP to join with a phosphate = ATP

Question 6

ETC oxidation - moving down the gradient from high energy to low energy

what happens when energy is released during this process (refer to drawing)

Answer 6

The energy released is used to pump H+ protons into outer membrane compartment through the ETC complexes

The H+ protons now want back in to the matrix - this is where ATP is made using the ATP synthase

Question 7

Role of Coenzyme Q and cytochrome in the respiratory chain

Answer 7

They are mobile electron carriers - shuttle electrons between carriers

Question 8

How many ATP’s produced from 1NADH and 1 FADH2 from electron transport chain

Answer 8

NADH = 3ATP 
FADH2= 2ATP 

= 5 ATP