UPSC prelims 2009 Zooology Fully Solved Paper
Zoology for UPSC, State Civil Service
1.Consider the following pairs:
Membrane proteins: Functions
1. Sodium channel: Helps in entry of sodium into the cell
2. Potassium channel: Helps in entry of potassium into the cell
3. Sodium-potassium ATPase: Helps in exit of sodium and entry of potassium [...]

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