$1.$ What is the primary goal of an enzyme assay?

A$)$ To identify enzymes

B$)$ To measure the activity of enzymes

C$)$ To visualize enzymes

D$)$ To destroy enzymes

$2.$ Pasteurization differs from sterilization in that it:

A$)$ Kills all microorganisms

B$)$ Only reduces microbial load

C$)$ Increases nutritional value

D$)$ Is used only for beverages

$3.$ In batch sterilization, the media is:

A$)$ Continuously sterilized over a long period

B$)$ Sterilized in one batch at a time

C$)$ Not exposed to high temperatures

D$)$ Exposed to chemicals only

$4.$ Direct injection sterilization is typically used for:

A$)$ Solid food items

B$)$ Air purification

C$)$ Liquid media

D$)$ Surgical instruments