One of the two main types of transport

One of the two main types of transport that involve (1) , as opposed to passive, transport is known as (2) . Here, (3) molecules move substances either in or out of a cell in a manner that (4) the rate of diffusion across the membrane. The mechanism involved combines molecules that are to be (5) across the membrane with the carrier molecules in the membrane. In such a manner, molecules are picked up on one side of the membrane and released on the other side.