Question

1. at which ph level does this enzyme work best? image 4

a. 6
b. 2
c. 10
d. 7

Explanation:

To solve this, we analyze typical enzyme pH optima:

• Option a (pH 6): Some enzymes (e.g., certain plant enzymes) work here, but many common enzymes (like human digestive or metabolic enzymes) have a different optimal pH.
• Option b (pH 2): Only very acidic enzymes (e.g., pepsin in the stomach) work at pH 2. Most enzymes are not adapted to such low pH.
• Option c (pH 10): Alkaline enzymes (e.g., some intestinal or soil enzymes) work here, but this is less common for most studied enzymes.
• Option d (pH 7): The majority of enzymes (especially those in neutral cellular environments, like many metabolic enzymes, or enzymes in blood/extracellular fluid) have an optimal pH around 7 (neutral), as this matches the pH of most cells and body fluids.

Answer:

d. 7