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Diffusion

Many molecule...

Question

Many molecules can move briefly across the membrane without any requirement of energy and special membrane proteins. This is called ______.

A

active transport

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B

passive transport

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C

facilitated diffusion

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D

all of these

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Solution

The correct option is C passive transport
Passive transport is movement of molecules across the membrane without any requirement of energy and special membrane protein to facilitate the movement.

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Similar questions

Q. Facilitated diffusion requires protein channels to transport molecules across a membrane but does not require a concentrantion gradient.

Q. In which type of passive transport simple diffusion or facilitated diffusion. A carrier protein is required for transport across the membrane.

Q. Short / Long answer type questions.
The small molecules of gases and water can readily, diffuse.across a membrane based
on diffusion gradients. Other molecules move against a gradient due to specific carriers that use energy for active transport. How could a cell move a variety of molecules, such as CV, against a gradient without having a specific transport system that actively moves this molecule?

Q. Properties related to facilitated diffusion and active transport but not to simple diffusion, are
A. Require special membrane proteins
B. Highly selective
C. Saturation
D. Response to protein inhibitors

Q. When transport proteins simultaneously move two molecules across a membrane in the same direction, the process is called

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