Enzyme X Exhibits Maximum Activity at PH = 6

question 36

Multiple Choice

Enzyme X exhibits maximum activity at pH = 6.9. X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4. One likely interpretation of this pH activity is that:

• A) a Glu residue on the enzyme is involved in the reaction.
• B) a His residue on the enzyme is involved in the reaction.
• C) the enzyme has a metallic cofactor.
• D) the enzyme is found in gastric secretions.
• E) the reaction relies on specific acid-base catalysis.

---

Definitions:

Cones

Cells in the eye's retina known as photoreceptors, which are optimal in well-lit conditions and allow for the observation of colors.

Rods

Photoreceptor cells in the retina that are highly sensitive to low levels of light and are important for night vision.

Periphery

The outer limits or edge of an area or object, often referring to areas situated away from a central point.

Sensitivity

The ability to detect or respond to slight changes, signals, or influences.