Astudent has been shrunk to a size small enough to be inserted into one of the membranebound disks of a granum. that student travels completely out of the chloroplast into the cytosol of the plant cell. how many plasma membranes in total did the student travel through?

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.