GENERAL HISTOLOGY

Detailed explanation-1: -Transport proteins function in both active and passive transport to move molecules across the plasma membrane. Two main groups of transport proteins can be found within the plasma membrane, and each helps water-loving molecules pass across the plasma membrane.

Detailed explanation-2: -The process of endocytosis and exocytosis are utilized by all the cells for transportation of molecules which cannot passively permeate via the membrane. Endocytosis is the process of active transportation of molecules into the cells by the action of engulfing it along with its membrane.

Detailed explanation-3: -Facilitated diffusion is the diffusion of solutes through transport proteins in the plasma membrane. Facilitated diffusion is a type of passive transport. Even though facilitated diffusion involves transport proteins, it is still passive transport because the solute is moving down the concentration gradient.

Detailed explanation-4: -(See below.) Active transport uses carrier proteins, not channel proteins. These carrier proteins are different than the ones seen in facilitated diffusion, as they need ATP in order to change conformation.