An Enzymeʹs Active Site Contains an Arginine Residue and a Glutamate

question 47

Multiple Choice

An enzymeʹs active site contains an arginine residue and a glutamate residue with pK_aʹs of 2.9 and 9.1, respectively. Both residues are actively involved in the catalytic mechanism and they are the only two ionizable residues in the active site. What would you expect for the optimum pH of the enzyme?

• A) 6.0
• B) 7.0
• C) 7.4
• D) No pH can be determined since the information is irrelevant to the optimum pH.

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Definitions:

Demand Increases

A situation in which the desire and willingness to purchase a good or service rises, often due to factors like income growth or preference changes.

Substitute Good

A good that can replace another to satisfy similar needs or desires, often influenced by changes in prices and consumer preferences.

Downsloping Demand

A situation where the demand for a good decreases as the price increases, following the typical law of demand.

Upsloping Supply

A supply curve that increases from left to right, indicating a direct relationship between price and quantity supplied.