Question

8. Aerobic Metabolism:a. Place the following components of aerobic metabolism in the correct order on the line below: a) transfer of electrons to O2, b) citric acid cycle, c) glycolysis, d) H+ pumping/ATP synthesis, e) formation of acetyl-CoA, f) pair of electrons passes through complexes I, III, and IV (You can just write the correct letters on the line below.)________________________________

b. Electron Transport Chain

1) ________ Which complex in the electron transport chain is also an enzyme in the citric acid cycle?

2) ________ Which complex in the electron transport chain does not involve transport of protons across the inner mitochondrial membrane?

3) ________ A pair of electrons starting through this complex leads to the production of 1.5 ATP molecules.

c. ATP Synthase

1) ________ How many protons must be pumped into the matrix to generate 1 ATP molecule in humans?

2) Put the Roman or Greek letter corresponding to the subunit of ATP Synthase that the statement is referring to. (Only 1 letter per statement.)

i. Major contributor of amino acids to the catalytic (active) sites______

ii. Exit site for H+’s to the matrix ________

Answer 1

8. A) the correct answer order is as follows:-

c, e, b, f, d, a.

Explanation- In aerobic respiration, glucose is broken down to 2 molecules of pyruvate. These pyruvate molecules are converted to Acetyl Co.A to enter the citric acid cycle. Then Acetyl Co.A takes part in citric acid cycle where NADH and FADH and ATP are formed.NADH and FADH are electron acceptors which are used in ETS to transport electron and H+ ion through the complexs. These electrons are then drawn to oxygen.

B)

1) complex II

Explanation- complex II is also called as succinate dehydrogenase. It is the second entry point to Electron transport chain from citric acid cycle.

2) complex II

Explanation-FADH2 feeds them into the transport chain through complex II, which doesnot pump protons across the membrane.

3) FADH2 / NADH

Explanation-Oxidative phosphorylation can also produce 1.5ATP molecules per electron pair of NADH or FADH2 produced by glycolysis.

Hope this helps you. Thank you!?