Question

Which of the following represent fermentation of lactose to lactic acid by homofermentative bacteria?

• A. Lactose + 1 H\(_3\)PO\(_4\) + 1 ADP \(\rightarrow\) 2 Lactic Acid + 2 ATP + 2 H\(_2\)O
• B. Lactose + 4 ADP + 4 H\(_3\)PO\(_4\) \(\rightarrow\) 4 Lactic Acid + 4 ATP + 3 H\(_2\)O
• C. Lactose + 2 ADP + 2 H\(_3\)PO\(_4\) \(\rightarrow\) 2 Lactic Acid + 2 ATP + 3 H\(_2\)O
• D. Lactose + 3 ADP + 3 H\(_3\)PO\(_4\) \(\rightarrow\) 3 Lactic Acid + 3 ATP + 3 H\(_2\)O

Hint:

One mole of lactose contains two hexose units.
Since homofermentative glycolysis yields 2 ATP per hexose unit, the complete fermentation of one mole of lactose must yield 4 ATP and 4 lactic acid molecules.

Answer 1

The Correct Option is B