Question

Fermentation ALWAYS results in the production of _______________________.

acetic acid

NADH

NAD+

ethanol

Which electron acceptor in respiration yields the largest ATP gain?

oxygen

Fe³⁺

sulfate

hydrogen

The electron transport chain uses the energy obtained by redox reactions to create a gradient of _________ that is then used to synthesize ATP. Choose all that apply.

CO₂

Na+

H₂O

H⁺

e^-

O₂

Which of the following metabolic processes use the electron transport chain? Choose all that apply.

Anaerobic respiration

Kreb's cycle

Fermentaion

Aerobic respiration

Answer 1

1. The correct answer is NAD+. The common product that are found in all fermentation are Ethanol, carbon dioxide, lactic acid and hydrogen gas. Though fermentation represent a common reaction in which NADH reduces an organic molecule to produce NAD+ and an organic alcohol product.  Though various products are also produced in fermentation but NAD+ is a common in all fermentation process.

2. The correct answer is Oxygen. Oxygen is the last electron acceptor in the Electron transport chain. Since oxygen molecule is a very strong oxidising agent therefore it is avery good electron acceptor. Hence it produce the largest potion of the high energy ATP gain.

3. The correct answey is H+. During chemiosmosis the energy obtain by the series of redox reaction is used by ETC to create a proton gradient in the inner mitochondrial membrane. Thus they flow though ATP synthase and cause production of ATP.

4. The correct answer is anaerobic respiration and aerobic respiration. ETC is used in all the metabolic pathways but not in fermentation. Since fermentation do not use ETC thus it is not respiratory pathway. Krebs cycle provide NADH and FADH2 that give electrons to ETC. Krebs cycle thus do not posses ETC but cooperate with ETC to carry ou metabolic processes.

Answer 2

1. The correct answer is NAD+. The common product that are found in all fermentation are Ethanol, carbon dioxide, lactic acid and hydrogen gas. Though fermentation represent a common reaction in which NADH reduces an organic molecule to produce NAD+ and an organic alcohol product.  Though various products are also produced in fermentation but NAD+ is a common in all fermentation process.

2. The correct answer is Oxygen. Oxygen is the last electron acceptor in the Electron transport chain. Since oxygen molecule is a very strong oxidising agent therefore it is avery good electron acceptor. Hence it produce the largest potion of the high energy ATP gain.

3. The correct answey is H+. During chemiosmosis the energy obtain by the series of redox reaction is used by ETC to create a proton gradient in the inner mitochondrial membrane. Thus they flow though ATP synthase and cause production of ATP.

4. The correct answer is anaerobic respiration and aerobic respiration. ETC is used in all the metabolic pathways but not in fermentation. Since fermentation do not use ETC thus it is not respiratory pathway. Krebs cycle provide NADH and FADH2 that give electrons to ETC. Krebs cycle thus do not posses ETC but cooperate with ETC to carry ou metabolic processes.

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