When Quorn® was first marketed it was described as being 'mushroom in origin' What does this mean?

Explanation:

Though until recently the manufacturer's (Marlow Foods) advertising and labeling implied that the product is “mushroom protein” or “mushroom in origin,” the mold (or fungus) from which it is made does not have much to do with mushrooms. Rather, the mold is grown in liquid solution in large tanks

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?