This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Membrane Structure & Function, Subject name: Biochemistry
True about active transport are all except 
Select and explain. 
A. It is saturable, B. It requires energy, C. It is not a carrier mediated process, D. It is multi-directional
D: It is multi-directional
Answer: D: It is multi-directional 
Explanation: Ans: d (It is multi-directional) Ref: Vasudevan 4th ed/ p. 16Active transport is not multi-directional. It is unidirectional.Active transport: -It requires energy.It is unidirectional.-It requires specialised proteins called Transporters.It is saturable.These transporters are susceptible to inhibition.Note:Facilitated diffusion is carrier mediated.