Biology Bioenergetics BUMHS 2022
PMDC Verified Question 64 of 67
Which of the following is used in baking?
A
Aerobic respiration
B
External respiration
C
Internal respiration
D
Anaerobic respiration
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Anaerobic respiration
Concept:

The baking of bread relies on the metabolic byproducts of yeast.

Solution:

  • In baking, yeast cells are trapped inside the dough where oxygen is rapidly depleted.
  • The yeast undergoes anaerobic respiration (alcoholic fermentation), converting sugars into ethanol and \( CO_2 \) gas.
  • The trapped \( CO_2 \) bubbles cause the dough to rise, giving bread its fluffy texture.


Why other options are incorrect:

  • Aerobic respiration does not produce the rapid burst of \( CO_2 \) gas in a trapped, oxygen-deprived dough environment necessary for rising.

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