Mastering Biology Oxidative Phosphorylation Activity

Place the following events of the electron transport chain in order. (5)

1) Oxidation of NADH 2) Electrons enter the electron transport chain 3) Release of energy for ATP synthesis 4) Electrons leave the electron transport chain 5) Reduction of oxygen and formation of water

For each glucose that enters glycolysis, _____ NADH enter the electron transport chain.

10

Structure A is _____. (enzyme which produces ATP)

ATP synthase

Imagine an organism with mutations in complexes I, III, and IV that prevent pumping of hydrogen ions into the intermembrane space but still allow electrons to pass through the electron transport chain. Which of the following is the most likely consequence of these mutations?

ATP synthase will not convert ADP to ATP.

What occurs as electrons pass through the multiple carrier molecules of the electron transport chain?

Energy is released in a stepwise fashion.

What molecule releases the electrons used in the electron transport chain?

NADH

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

NADH and FADH2 ... intermembrane space

Select the three true statements about oxidative phosphorylation. -Oxidative phosphorylation is the second step in aerobic respiration, occurring after glycolysis but before the citric acid cycle. -NADH and FADH2 deliver electrons to the electron transport chain during oxidative phosphorylation. -Some, but not all, of oxidative phosphorylation occurs inside mitochondria. -Without oxygen, oxidative phosphorylation would not occur. -Chemiosmosis is the final step in oxidative phosphorylation.

NADH and FADH2 deliver electrons to the electron transport chain during oxidative phosphorylation. Without oxygen, oxidative phosphorylation would not occur. Chemiosmosis is the final step in oxidative phosphorylation.

Oxidative phosphorylation is the last step of ____________.

cellular respiration

What is being pumped through the inner mitochondrial membrane into the intermembrane space, as indicated by the green arrows?

hydrogen ions

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

kinetic energy that is released as hydrogen ions diffuse down their concentration gradient

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

oxidative phosphorylation

The final electron acceptor of cellular respiration is _____.

oxygen