AMU Medical AMU Solved Paper-1998

  • question_answer
    Uptake of mineral ions against concentration gradient is called

    A)  active absorption  

    B)  passive absorption

    C)  negative absorption

    D)  none of these.

    Correct Answer: A

    Solution :

    : Active transport is the transportation or movement of a substance across the cell membrane (plasma membrane which is selectively permeable membrane) against the concentration gradient by using metabolic energy. This implies movement of molecules from areas of low to areas of high concentration. Electrochemical gradient gives the plasma membrane its electrical potential.


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