Where does the energy come from to make atp at the chloroplast?
a) from the potential energy of hydrogen ions stored inside the thylakoid
b) from photons from the sun as they strike electrons in chlorophyll
c) from the kinetic energy of hydrogen ions passing through atp synthase
d) from the energy stored in the bonds of large glucose molecules

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.