Which organelles are found in both plant and animal cells?
a. ribosomes and lysosomes
b. mitochondria and nucleus
c. nucleus and cell wall
d. chloroplasts and ribosomes

How does the nervous system affect the excretory system?

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?

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.