A sodium potassium pump within a cell membrane requires energy to move sodium and potassium ions into or out of the cell. The movement of glucose into or out of the cell does not require energy. which statement best describes the movement of these materials across a cell membrane?

How many copies of each chromosomes should be present in each of the 4 final haploid versions of gamete?

How do chloroplasts set plants apart from other living things

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.