The entry and exit of ions to and from the symplast requires the expenditure of

Consider the following statements and choose the correct answer:
$I.$ Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with protein side chains.
$II.$ Different types of proteins present in the membrane play a major role in both active as well as passive transport.
$III.$ The carrier proteins needed by facilitated and active transport are specific.
$IV.$ There is no need of energy to pump molecules against a concentration gradient in active transport.
$V.$ Transport rate reaches a saturation point when all the active proteins are used.

The movement of ions against the concentration gradient is called ........

Facilitated diffusion in cells is brought about by . . . . . . in the cell membrane.

Give the definition of diffusion and write its properties.

How is facilitated diffusion different from diffusion?