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Q.

What is the requisite for transporting substances against the concentration gradient?

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a

Simple diffusion

b

Expenditure of energy

c

Lipids

d

 Facilitated diffusion 

answer is A.

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Detailed Solution

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement.

 

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