Question

What happens to the glucose molecules in the following?

(i) Yeast cells (ii) Muscle cells of man (iii) Tissue cells of man

Answer 1

Glucose molecules:

1. The primary source of energy in cells is glucose molecules.
2. Glucose breaks down in the presence or absence of oxygen to release energy.

(i) Yeast cells

1. Glucose molecules break down without oxygen in the yeast cells.
2. A glucose molecule leads to form ethanol, carbon dioxide and releases energy.

(ii) Muscle cells of man

1. Muscle cells work during contraction.
2. The glucose molecules break down without oxygen to produce lactic acid and energy.

(iii) Tissue cells of man

1. The breakdown of glucose in the tissue cells occurs in the presence of oxygen.
2. Glucose is oxidized to produce carbon dioxide and release energy.

(i) Yeast cells: ethanol, carbon dioxide and energy.

(ii) Muscle cells of man: lactic acid and energy.

(iii) Tissue cells of man: carbon dioxide and energy.