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Question
Identify a type of molecular movement which is highly selective and requires special membrane proteins, but does not require energy.
Solution
Highly selective requires of special membrane protein and does not require energy, this type of molecular movement is called facilitated diffusion. Any substance diffusion across a membrane depends on its soluble ability in lipids. The substance with hydrophilic moiety cannot diffuse through a membrane. So special membrane proteins are present to facilitate the diffusion of such molecules, here also diffusion occurs from higher to lower concentrations and so does ATP. Facilitated diffusion depends on transporter proteins as it is highly selective.
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RELATED QUESTIONS
When the movement of two molecules say 'A' and 'B' by a transport protein is independent of each other, it is known as
Given below is a table. Fill in the gaps
| Property | Simple diffusion | Facilitated transport | Active Transport |
| i Highly selective | ______ | Yes | ______ |
| ii Uphill transport | ______ | ______ | Yes |
| iii Requires ATP | ______ | ______ | ______ |
Various types of transport mechanisms are needed to fulfil the mineral requirements of a plant. Why are they not fulfilled by diffusion alone?
