7.7.1 The Respiratory Process in Energy Production (Structured Question 1 & 2)

Question 1:
Diagram below shows a type of organelle found in muscle cells.
A biochemical reaction occurs in the organelle.

Name this organelle. [1 mark]

Explain why membrane W is in the form of numerous folded layers. [2 marks]

The biochemical reaction that occurs in this organelle is summarized as follows:

(i) Name gas R. [1 mark]

Name product S. [1 mark]

Explain why the muscle cell has a large number of these organelles. [2 marks]

If the blood sugar level is lower than the normal range, the biochemical reaction in this organelle can still occur.
Explain how. [3 marks]

State two differences on the biochemical reaction occurring between muscle cell and yeast cell in the absence of gas R. [2 marks]


Membrane W is in the form of numerous folded layers to increase total surface area, for the efficiency of cellular respiration.

Gas R is oxygen

Product S is water

Muscle cells need a large number of mitochondrion as an energy ATP supply in order to oxidise glucose in aerobic respiration.

– If the blood sugar is lower than the normal range, less energy is produced.
– Pancreas secretes glucagon to convert glycogen to glucose.
– Cellular respiration occurs.


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