Question

The breakdown of glucose has taken the following pathway: 

\[\ce{Glucose ->[(a)] Pyruvate + Energy ->[(b)] Lactic acid + Energy}\]

The sites ‘a’ and ‘b’ respectively are:

Options

• Mitochondria and Oxygen deficient muscle cells

• Cytoplasm and Oxygen rich muscle cells

• Cytoplasm and Yeast cells

• Cytoplasm and Oxygen deficient muscle cells

Answer 1

Cytoplasm and Oxygen deficient muscle cells

Explanation:

Step (a): \[\ce{Glucose -> Pyruvate + Energy}\]

• This step is about glycolysis, which takes place in the cell's cytoplasm.
• Glycolysis is an anaerobic process, which means it doesn't need air.

Step (b): \[\ce{Pyruvate -> Lactic Acid + Energy}\]

• During anaerobic breathing, this happens in muscle cells that don't have enough oxygen.
• When muscles work hard and there isn't enough air, pyruvate turns into lactic acid, which makes muscles tired. 

The correct sites for ‘a’ and ‘b’ are cytoplasm and oxygen deficient muscle cells.