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Question

Identify the process by which substances are transported across cell membranes by means of protein carrier molecules?

A
Ion Pump
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B
Passive Transport
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C
Bulk Transport
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D
Faciliated Transport
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Solution

The correct option is D Faciliated Transport
In Faciliated transport, substances are transported across cell membranes by means of protein carrier molecules from lower to higher concentrations.
Ions flow passively through ion channels/pumps, down electrical and concentration gradients, at speeds that can approach the diffusion limit.
Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes.
Bulk transport is a type of transport which involves the transport of large amount of substance like lipid droplets and solid food particles across plasma membrane by utilising energy.

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