Anaerobic Fermentation

This quiz covers fermentation definition, ethanol vs. lactate pathways, NADH2's role, and efficiency comparison to aerobic respiration

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QUESTION OF
Views #: 2
Questions #: 9
Time: 10 minutes
Pass Score: 80.0%
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Naming the Oxygen-Free Energy Process

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Many cells, particularly those in plants and in some microorganisms, can obtain energy without oxygen by the anaerobic process of:

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Two Fermentation End Products

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Anaerobic Fermentation Pathways Fate of Pyruvate in the Absence of Oxygen Pyruvate (3-Carbon) Alcohol Fermentation (Yeast, Plants, Microbes) Releases COโ‚‚ Acetaldehyde (2-Carbon) NADH โ†’ NADโบ (Uses Hydrogen) Ethanol (2-Carbon Product) Lactic Acid Fermentation (Animals, Certain Bacteria) NADH โ†’ NADโบ (Uses Hydrogen Directly) Lactate / Lactic Acid (3-Carbon Product) Metabolic Purpose: Both pathways regenerate NADโบ, allowing Glycolysis to continue making ATP without oxygen.

Based on the diagram, which organisms typically convert pyruvate into ethanol during fermentation?

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The Animal Fermentation Pathway

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In animals and some microorganisms, what compound is produced when hydrogen is added to pyruvate during anaerobic respiration?

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Where the Hydrogen Comes From

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Without oxygen, pyruvate accepts hydrogen from (1), which frees more NAD to accept hydrogen in other glycolytic reactions.

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ATP
acetyl-CoA
NADH2
ADP
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Carbon Dioxide and Fermentation

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True or False: Carbon dioxide is released when pyruvate is converted into ethanol during fermentation.

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Why Glycolysis Is Sometimes Called Anaerobic Respiration

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Why is glycolysis itself sometimes referred to as anaerobic respiration?

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Efficiency of Aerobic vs. Anaerobic Pathways

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Organisms that use glycolysis together with aerobic respiration produce how much more energy than anaerobic species breaking down the same food?

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Classify Fermentation Products and Producers

2 pts

Sort each item into the correct category

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Lactic Acid Buildup During Exercise

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During intense exercise, when muscle cells cannot get enough oxygen fast enough, which fermentation product tends to build up in the muscle?

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0
sin cos tan
sin-1 cos-1 tan-1 ฯ€ e
xy x3 x2 ex 10x
yโˆšx 3โˆšx โˆšx ln log
( ) 1/x % n!
7 8 9 + MS
4 5 6 โ€“ M+
1 2 3 ร— M-
0 . EXP รท MR
ยฑ RND C = MC
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