Biology Bioenergetics UHS 2023
PMDC Verified Question 29 of 67
Which of the following is used in baking?
A
Aerobic respiration
B
Anaerobic respiration
C
External respiration
D
Internal respiration
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Anaerobic respiration
Concept:

The baking industry relies heavily on the metabolic byproducts of Saccharomyces cerevisiae (baker's yeast).

Solution:

  • When mixed into dough, the environment rapidly becomes devoid of oxygen.
  • The yeast shifts to anaerobic respiration (alcoholic fermentation) to survive.
  • This process converts sugars into ethanol and \( CO_2 \). The trapped \( CO_2 \) bubbles cause the bread dough to rise.


Why other options are incorrect:

  • Aerobic respiration requires oxygen and does not produce the intense, rapid gas accumulation necessary for rising dough.

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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