Test is
select the answer that completes the following sentence.

to demonstrate vacuoles and lysosomes in class, a video of was shown.
question 3 options:

white blood cells engulfing bacteria

fixed animal cells under 1000x magnification

fixed plant cells under 1000x magnification

an amoeba eating two paramecium

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.