Identify the following structures as being found only in the an animal (a), only in a plant(p) or found in both(b).

answers:
1.animal only (a)
2. plants only (p)
3. both (b)

match the number to what it belongs too.

nucleus:

water vacuole:

chloroplast:

lysosome:

smooth endoplasmic reticulum:

mitochondria:

cellulose cell wall:

golgi apparatus:

rough endoplasmic reticulum:

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.