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9 Nov 2018

Skeletal muscle contracting under anaerobic conditions further metabolize the pyruvate produced by glycolysis to lactic acid as part of a fermentation reaction.Why is this reaction essential for the anaerobically functioning cell?

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Keith LeannonLv2

12 Nov 2018

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1) In eukaryotes, pyruvate is further metabolized via three main catabolic pathways. Circle the following correct statements

I. Under anaerobic conditions, pyruvate is oxidized leading to the formation of acetyl-CoA and CO2

II. Under aerobic conditions, pyruvate is oxidized leading to the formation of acetyl-CoA and CO2

III. Pyruvate can be reduced to lactate and CO2 during lactic fermentation

IV. Pyruvate can be reduced to ethanol and CO2 during alcoholic fermentation

V. Lactate produced by muscles from pyruvate is converted to glucose in the liver

VI. Lactate produced by the liver from pyruvate is converted to glucose in muscles

(31. What is the purpose of cellular respiration/

a. To get O2 into our bodies and to get CO2 out of our bodies

b. To use the energy of sunlight to synthesize sugars

c. To make ATP to power cellular activities d. To hydrolyze ATP

(36. Which of the following accurately describes a distinction between lactic acid fermentation and alcoholic (ethanol) fermentation?

a. Lactic acid fermentation occurs in prokaryotes, whereas alcoholic (ethanol) fermentation occurs in eukaryotes

b. The final electron acceptor in lactic acid fermentation is pyruvate; the final electron acceptor in alcoholic (ethanol) fermentation is acetaldehyde

c. In lactic acid fermentation, NADH is produced by glycolysis; in alcoholic (ethanol) fermentation, NADH is produced by the Krebs cycle

d. In lactic acid fermentation, cell use CO2 in place of oxygen; in alcoholic (ethanol) fermentation, cells use SO4

(37. Which pathway is see in both fermentation and aerobic respiration?

a. Krebs cycle

b. Electron transport

c. Glycolysis d. Pyruvate oxidation

(50. How many molecules of carbon dioxide (CO2) would be produced with 5 turns of the cirtic acid cycle?

a. 2

b. 5

c. 10

d. 12

e. 60

lilaccrocodile636

For each of the following statements about anaerobic metabolism, respond "True" or "False".
Select all that are True.
1) In fermentation the terminal electron acceptor is an organic compound.
2) For a bacterium to use anaerobic respiration it must have a supply of some oxidized mineral such as: nitrate or sulfate.
3) In ethanol fermentation the terminal electron acceptor is an inorganic compound.
4) The terminal electron acceptor in anaerobic respiration is a reducing reagent.
5) In lactic acid fermentation the terminal electron acceptor is pyruvate.

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Skeletal muscle contracting under anaerobic conditions further metabolize the pyruvate produced by glycolysis to lactic acid as part of a fermentation reaction.Why is this reaction essential for the anaerobically functioning cell?

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