IB Biology HL C1.2.16 Hl Oxygen As Terminal Electron Acceptor Questions

Learn why oxygen is the final electron acceptor at the end of the mitochondrial transport chain, where it combines with protons to form water in IB Biology HL C1.2.16.

Exam points

Explain that oxygen is the terminal electron acceptor at the end of the mitochondrial electron transport chain.
Explain how oxygen combines with electrons and protons to form metabolic water.

[Maximum number: 5]

Describe the role of oxygen in aerobic cell respiration.

a. terminal/final electron acceptor

b. at the end of electron transport chain

c. oxygen also accepts protons/hydrogen ions

d. water produced/ $\frac{1}{2}\mathrm{O}_{2} + 2\text{ electrons} + 2\mathrm{H}^{+} \rightarrow \mathrm{H}_{2}\mathrm{O}$

e. helps to maintain proton gradient «across inner mitochondrial membrane by removal of protons from the stroma»

f. oxygen is highly electronegative/electrons strongly attracted to oxygen

g. avoids anaerobic respiration/buildup of lactic acid

h. allows more electrons to be delivered to the electron transport chain

OR allows NAD/FAD to be regenerated/reduced NAD/FAD converted back to NAD/FAD

i. oxygen allows maximum yield of energy «from glucose» allows complete oxidation of glucose/allows fats to be used in respiration

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IB Biology HL C1.2.16 Hl Oxygen As Terminal Electron Acceptor Questions question 1