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?

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Solution

Such substances are moved by Facilitated transport.
Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins.

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Similar questions

Assertion (A): Active transport is uphill transport.

Reason (R): Active transport uses energy to pump molecules against the concentration gradient.

Consider the following statements and choose the correct answer.

I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with the protein.

II. Different types of proteins present in the membrane play a major role in both active as well as passive transport.

III. The carrier proteins needed by facilitated and active transport are specific.

IV. There is no need of energy to pump molecule against a concentration gradient in active transport.

V. Transport rate reaches the saturation point when all the active proteins are used.

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