What are special doorways in the cell membrane?

Answer 1

Proteins are too large to move across the phospholipid bilayer of the cell membrane so therefore require help getting into (or out of) the cell. Proteins may be brought across the cell membrane by endocytosis - they may then be broken down into amino acid building blocks (by fusion of the endocytotic vesicles with the proteolytic enzyme containing lysosomes) which can then be used by the cell or moved out of the cell by transmembrane transport proteins.

Answer 2

Special doorways in the cell membrane are called ion channels. These channels allow specific ions, such as sodium, potassium, and calcium, to pass through the membrane, regulating the movement of ions in and out of the cell. Ion channels play a crucial role in various cellular processes, including nerve signaling and muscle contraction.

Answer 3

the permeability of a particle depends on the size of the particle and the charge of the particle. If the particle is small and relatively neutral it is most likely able to permeate the phospholipid bilayer membrane, particles that are large and charged, negative or positive, are not able to pass through

These protein channels also have cholesterol markers, so some substances that match those markers are able to pass through regardless of charge or size

Osmosis is also another factor that always objects to go through a membrane through various processes, mostly endocytosis

Answer 4

Solute molecules, such as ions(Na/K) are transported across the membrane selectively by active transport. Gases such as oxygen or CO2, water molecules normally pass by simple diffusion. Ion channels are the proteins present on the membrane that allows the transport of molecules.

Answer 5

You could consider, carrier proteins to be special doorways in the cell membranes.

Answer 6

cellular diffusion, active and passive transport

Answer 7

it is nothing but a bunch of booty

Answer 8

it is proteins

Answer 9

active transport and pasive transport

Answer 10

Osmosis