Question

which solution is the negative control?
○ pepsin
○ distilled water
○ albumin
○ starch

Explanation:

A negative control is a group or condition in an experiment that is not expected to produce the desired effect (e.g., no reaction or change). Distilled water is often used as a negative control in biochemical experiments (like those involving enzymes or protein reactions) because it lacks the substances that would cause a reaction, unlike pepsin (an enzyme), albumin (a protein), or starch (a carbohydrate) which could be involved in reactions.

Answer:

B. Distilled water