Biology Bioenergetics UHS 2022
PMDC Verified Question 62 of 67
What is the end product of glucose by yeast in anaerobic respiration?
A
Ethanol and oxygen
B
Ethanol and water
C
Ethanol and \( CO_2 \)
D
Lactic acid and \( CO_2 \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Ethanol and \( CO_2 \)
Concept:

When oxygen is absent, yeast cells undergo alcoholic fermentation to regenerate \( NAD^+ \) so glycolysis can continue.

Solution:

  • In yeast, the pyruvic acid from glycolysis is first decarboxylated to form acetaldehyde, releasing Carbon Dioxide (\( CO_2 \)).
  • The acetaldehyde is then reduced by NADH to form Ethanol.


Why other options are incorrect:

  • Oxygen is never a product of anaerobic respiration.
  • Lactic acid is the end product of anaerobic respiration in animal muscle cells and certain bacteria, not yeast.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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