Identify the structures in the cell pictured on the right

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?

Some substances but not other can cross the (blank) membrane of a cell

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.