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2021-05-15

What Does facilitated diffusion transport?

What Does facilitated diffusion transport?

Facilitated diffusion is the diffusion of solutes through transport proteins in the plasma membrane. Facilitated diffusion is a type of passive transport. A transport protein completely spans the membrane, and allows certain molecules or ions to diffuse across the membrane.

Does facilitated diffusion transport require energy?

A. Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.

Which of the following molecules can move across the membrane by facilitated diffusion?

Facilitated diffusion therefore allows polar and charged molecules, such as carbohydrates, amino acids, nucleosides, and ions, to cross the plasma membrane. Two classes of proteins that mediate facilitated diffusion are generally distinguished: carrier proteins and channel proteins.

Which of the following is a characteristic of facilitated diffusion?

Which of the following is a characteristic of facilitated diffusion (passive transport) of a molecule across a membrane? It is highly specific for the molecule being transported. The direction of transport is determined by concentration and/or electrochemical gradients.

What characteristic do simple and facilitated diffusion share?

What characteristic do simple diffusion and facilitated diffusion share? Both require cellular energy for the transport of substances. Both move a substance from a region of higher concentration to one of lower concentration without cellular energy.

What do active transport and facilitated diffusion have in common?

What do facilitated diffusion and active transport have in common? How are they different? They both change the concentration level inside and outside the cell. Active transport requires energy and moves low concentration to high concentration.

Which of the following best describes secondary active transport?

Which of the following best describes secondary active transport? Secondary active transport occurs when the movement of one substance is coupled with the passive transport of a second substance.