21- Explain the process of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with
the help of word equations.
Answers
Answer:
To obtain energy, organisms break down glucose into carbon dioxide and water. Some organism involves pathways that use oxygen and some do not for this process.
(A) Anaerobic respiration in yeast:
(i) The first step is to break down glucose ( carbon molecule) into pyruvate ( carbon molecule).
(ii) Then this pyruvate is converted into ethanol and carbon dioxide.
(iii) This process takes place in the cytoplasm.
(iv) Since this process takes place in the absence of oxygen, it is called anaerobic respiration.
(B) Aerobic respiration in mitochondria:
(i) The break down of pyruvate occurs inside the mitochondria.
(ii) In this process, the three molecules of pyruvate is broken down to give three molecules of carbon dioxide and water.
(iii) This process takes place in the presence of oxygen and thus, called aerobic respiration.
(C) Anaerobic respiration in muscle cells:
(i) Sometimes, there is a lack of oxygen in our muscle cells and hence, the beak down of pyruvate occurs anaerobically.
(ii) In this process, the three-carbon molecule, pyruvate, is converted into a three-carbon molecule, lactic acid.
(iii) The build-up of this lactic acid in our muscle cells cause cramps during sudden activities.
Explanation: