Anaerobic Respiration and Fermentation

Concept: Anaerobic Respiration


Concept: Fermentation


Concept: Metabolic Pathways


Anaerobic Respiration and Fermentation Additional Practice Problems

Give the function of each of the following: (a) coenzyme (b) allosteric site.

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What is the difference between the terms; anaerobic bs aerobic.

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Fermentation, an anaerobic respiration, is characterized by the following electron acceptor(s):

A. organic compounds

B. oxygen



E. More than one of the above are correct

F. None of the above are correct

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During what conditions do organisms switch from aerobic respiration to fermentation?

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Which of the products below are potential fermentation products?

A. Ethanol

B. Lactate or lactic acid

C. Hydrogen

D. A and B

E. A, B, and C

F. none of the above

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In fermentation of sugars by yeast, what are the reactants and what are the products?

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Which of the following statements is TRUE regarding fermentation?

A. It can be used as an alternative to photosynthesis.

B. It results in the partial oxidation of C6H12O6.

C. It can only be done by prokaryotes.

D. It requires oxygen.

E. It releases more energy from C6H12O6 than cellular respiration.

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Yeasts and many bacteria are facultative anaerobes that is, they make ATP by fermentation in the absence of oxygen, but if oxsygen is present, they can undergo aerobic respiration. Why would it be advantageous for them to be able to make ATP by aerobic respiration? Hint: Compare the amount of ATP produced in each process.

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the net products of anaerobic respiration are

A. 2 ATP, NAD+, either lactic acid or ethanol and CO2.

B. 2 ATP, NADH, either lactic acid or ethanol and CO2.

C. 2 ATP, NADH, ethanol and CO2.

D. 4 ATP, NAD+, either lactic acid or ethanol and CO2.

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What is the role of fermentation in yeast? Under what environmental conditions will fermentation occur? What product is produced and secreted by the yeast as a result?

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Describe the major differences between fermentation, aerobic respiration, anaerobic respiration? Which has the potential to yield the most energy?

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What do aerobic cellular respiration and fermentation have in common? 

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What purpose does calcium sulfate serve in the Winogradsky column?

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What is the key metabolic difference between anaerobic respiration and fermentation?

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What is the difference between a strict anacrobe and a facultative anaerobe?

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1. Where in the cell does each reaction take place?

Fermentation -

2. Name the Reactant and Products for each reaction

- Glycolysis



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Compare and contrast anaerobic respiration and fermentation. How are they similar and how do they differ?

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Fermentation can be described as a process

a. that takes place only in the absence of oxygen

b. in which water is not one of the by-products

c. in which the Krebs cycle and electron transfer through ETC do not occur

d. all of the above are true

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What cellular evolutionary event is most likely responsible for a switch from Fermentation to the Citric Acid Cycle and Oxidative Phosphorylation?

a. The evolution of the endoplasmic reticulum

b. The development of the nuclear envelope and a true membrane bound nucleus

c. The introduction of a mitochondrion into an animal cell

d. The development of a flagellum

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No O2 was necessary for the citric acid cycle.

During oxygen debt, why would muscle cells choose lactic acid fermentation (which produces no ATP) over sending the pyruvate molecules to the citric acid cycle (2 more ATP molecules)?

a. Muscle cells do not have mitochondria

b. The ATP produced in the citric acid cycle cannot be used for cellular work

c. The production of CO2 in the citric acid cycle is detrimental to the cell

d. The citric acid cycle does not provide a mechanism for oxidizing NADH back to NAD+

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Why do our muscle cells perform fermentation to produce lactic acid during strenuous exercise when more ATP can be generated by cellular respiration?

a. Fermentation is a quicker process

b. Muscle cells don’t need energy, they just want to get rid of excess glucose

c. Lactic acid has a positive effect on muscle cell function

d. There is not enough O2 in the cells to perform cellular respiration

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