Electron Transport

Part A

For each glucose that enters glycolysis, _____ acetyl CoA enter the citric acid cycle.

	1
	5
	4
	2
	0

Correct

Each glucose produces two pyruvates, each of which is converted into acetyl CoA.

Part B

For each glucose that enters glycolysis, _____ NADH + H⁺ are produced by the citric acid cycle.

	3
	6
	2
	3 to 6
	0

Correct

3 NADH + H⁺ are produced per each acetyl CoA that enters the citric acid cycle.

Part C

In cellular respiration, most ATP molecules are produced by _____.

	photophosphorylation
	cellular respiration
	photosynthesis
	oxidative phosphorylation
	substrate-level phosphorylation

Correct

This process utilizes energy released by electron transport.

Part D

The final electron acceptor of cellular respiration is _____.

	CO2
	oxygen
	FADH2
	NADH
	water

Correct

Oxygen is combined with electrons and hydrogen to form water.

Part E

During electron transport, energy from _____ is used to pump hydrogen ions into the _____.

	acetyl CoA ... intermembrane space
	NADH and FADH2 ... intermembrane space
	NADH and FADH2 ... mitochondrial matrix
	NADH ... mitochondrial matrix
	NADH ... intermembrane space

Correct

The energy released as electrons, which have been donated by NADH and FADH2, is passed along the electron transport chain and used to pump hydrogen ions into the intermembrane space.

Part F

Structure A is _____.

	an electron acceptor
	ATP synthase
	phospholipid
	an electron donor
	sensory protein

Correct

ATP synthase phosphorylates ADP.

Part G

The proximate (immediate) source of energy for oxidative phosphorylation is _____.

	substrate-level phosphorylation
	ATP synthase
	ATP
	NADH and FADH2
	kinetic energy that is released as hydrogen ions diffuse down their concentration gradient

Correct

Concentration gradients are a form of potential energy.