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Electron Transport System and Formation of ATP (Quiz 2)

How does Cyanide kill you? The final stage of cellular respiration is the electron transport chain (ETC). The ETC is a series of molecules embedded in the mitochondrial membrane. The first molecule accepts protons and electrons from the products of the Krebs Cycle. The electrons are passed from molecule to molecule and finally react with oxygen and protons to form water. Without oxygen the final reaction cannot occur. This causes a ‘traffic jam’ in that electrons further back on the chain cannot be transferred. The entire process stops. In the absence of oxygen the ETC stops working and no ATP is generated. Cyanide prevents oxygen from binding to the final molecule in the electron transport chain. Individuals poisoned with cyanide die from oxygen deprivation even though their cells may have abundant oxygen.

View the animation below, then complete the quiz to test your knowledge of the concept.

1Protons received from NADH
A)act as coenzymes
B)are passed along the electron transport chain along with the electrons
C)are the terminal electron acceptors
D)are pumped outside the cell

2Oxygen acts as
A)a carrier of electrons, passing electrons down the chain
B)a reducing agent
C)the terminal electron acceptor
D)a coenzyme

3When protons are pumped outside the cell membrane
A)water is made
B)a proton motive force is created
C)NADH gets reduced
D)electrons are lost

4A hydrogen atom consists of a proton and a pair of electrons.

5The energy captured in the phosphorylation of ADP to ATP comes from the proton motive force created in respiration.

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