Complete the following statement: Oxygen is a reactant of (1) while being the product for (2). (4 points) a

(1) photosynthesis, (2) fermentation

b

(1) aerobic respiration, (2) photosynthesis

c

(1) fermentation, (2) anaerobic respiration

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.