Mention the peculiarities of facilitated diffusion.

As cells in the cortex are loosely packed,what is the effect on water movement?

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

Movement and accumulation of ions across a membrane against their concentration gradient can be explained by

Active transport differs from passive transport in that active transport

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.