jjf mcat bio ch3 pt3

Each carrier in the ETC is ________ when it accepts an electron and is ________ when it passes it on to the next carrier.

reduced; oxidized

What happens to the ETC in the absence of oxygen?

the ETC is backlogged with electrons (thus NAD+ cannot be regenerated)

What does ETC stand for?

the Electron Transport Chain

Where does the Electron Transport Chain take place?

the inner mitochondrial membrane

What is the reaction of the reduction of O2 in the ETC?

2H+ + 2e- + 1/2 O2 => H2O

How many ATP are created from NADH in the ETC?

30

How many ATP are created from FADH2 in the ETC?

4

What is the first molecule of the electron transport chain?

FMN (flavin mononucleotide)

What is the net reaction of the oxidation of NADH?

NADH => NAD+ + H+ + 2e-

During oxidative phosphorylation, ATP is produced when high energy potential electrons are transferred from ________ and ________ to _________ by carrier molecules in the inner mitochondrial membrane.

NADH and FADH2; oxygen

Is the intermembrane space of the mitochondria basic or acidic?

acidic

Is the mitochondrial matrix basic or acidic?

basic

What is the last carrier of the ETC?

cytochrome a3

Most of the molecules in the ETC are _____________.

cytochromes

FMN stands for _______________.

flavin mononucleotide

Cytochromes

iron-containing carriers of electrons capable of undergoing reversible redox reactions

What is the mechanism of the poison cyanide?

it blocks the transfer of electrons from cytochrome a3 to O2

What happens to FMN (flavin mononucleotide) in the ETC?

it is reduced when it accepts electrons from NADH, oxidizing NADH into NAD+

What happens to cytochrome a3 in the ETC?

it passes its electron to O2

What is the mechanism of the poison dinitrophenol?

it uncouples the electron transport chain from the proton gradient established across the inner mitochondrial membrane