Study the properties of various means of short distance transport and choose the correct combination among A, B, C and D
Property Simple diffusion Facilitated diffusion Active transport
A Requirement of special membrane proteins. Yes Yes No
B Transport saturates No No Yes
C Uphill transport No No Yes
D Requirement of ATP Yes No Yes

	Property	Simple diffusion	Facilitated diffusion	Active transport
A	Requirement of special membrane proteins.	Yes	Yes	No
B	Transport saturates	No	No	Yes
C	Uphill transport	No	No	Yes
D	Requirement of ATP	Yes	No	Yes

Easy

Solution

Only during active transport there is uphill transport with the expenditure of energy or ATP.
During diffusion and facilitated diffusion the transport is down hill and no expenditure of energy or ATP.

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