Electron Transport Chain

Question 1

purpose

Answer 1

• oxidize NADH and FADH2—> NAD+ and FAD

- reduce O2–>pump H+ into IMS

Question 2

reaction 1

Answer 2

In: NADH(r) + UQ(o)
Out: NAD+(o) + UQH2(r)
Products: 4H+(M)–>4H+(IMS)
Enzyme: Complex 1

Question 3

reaction 2

Answer 3

In: FADH2 + UQ
Out: UQH2 + FAD
Products: none
Enzyme: Complex 2

Question 4

reaction 3

Answer 4

In: UQH2 + 2Cytochrome C(o)Fe3+
Out: UQ + 2 Cytc(r)Fe2+
Products: 4H+(M)–>4H+(IMS)
Enzyme: Complex 3

Question 5

reaction 4

Answer 5

In: 2 cytc(r) + 1/2 O2
Out: H2O + 2cytc(o)
Products: 2H+(M)-->2H+(IMS)
                 2H+-->
Enzyme: Complex 4

Question 6

manner of rxns

Answer 6

all easily reversible

Question 7

Regulated

Answer 7

Complex 4 can be inhibited by CN-, N3-

Question 8

outcome

Answer 8

1 NADH oxidized–> 10 H+ in IMS

1 FADH2 oxidized–> 6 H+ in IMS