Carrier molecules are molecules that play a role in transporting electrons through the electron transport chain. Carrier molecules are usually proteins bound to a nonprotein group; they can undergo oxidation and reduction relatively easily, thus allowing electrons to flow through the system. There are four types of carrier: flavoproteins (e.g. FAD), cytochromes, iron-sulphur proteins (e.g. ferredoxin), and ubiquinone.
the transport of a substances through a cell membrane along a concertration gradient with the aid of a carrier
Facilitated Diffusion is the answer
Facilitated Diffusion
Active transport uses energy to move substances against the concentration gradient.
active transport
no because it is a form of passive transport. only active transport requires energy. facilitated diffusion just means that it cant be just absorbed through the membrane, it must go through specific chanels or be helped by transport proteins. but because facilitated diffusion moves from higher to lower concentrations, it requires no energy.
Solute pump
Active transport is used to move molecules and ions across a membrane against their concentration gradient. "Active" means that the transporter requires energy to do its job (eg. glucose).
Active transport uses energy to move substances against the concentration gradient.
no down a concentration gradient high to low if its low to high it requires energy
Yes, active transport requires carrier proteins in order to function. These require ATP to carry things in and out of the cell.
Energy-requiring process by which substances move across the plasma membrane against a concentration gradient.
Active transport requires an input of energy and can move substabces against their concentration gradient. Passive transport does not require added energy and can move substances only down their concentration gradient.
active transport
no because it is a form of passive transport. only active transport requires energy. facilitated diffusion just means that it cant be just absorbed through the membrane, it must go through specific chanels or be helped by transport proteins. but because facilitated diffusion moves from higher to lower concentrations, it requires no energy.
Because there is a higher concentration inside the cell then out side ....because it requires energy to move the molecules outside in a different direction then they would normally move, it is like riding a bike up a hill it requires energy.
Yes - as endocytosis requires energy.
passive diffusion requires absolutely nothing, no energy either, the particles simply flow from a high concentration gradient to a low concentration gradient. Active transport however require carrier proteins to allow the particles through the cell membrane
Solute pump
Diffusion is the movement of molecules or partocles from an area of high concentration to an area of lower concentration, and Facilitated diffusion is when substances difuse across cell membranes more rapidly than you might expect.