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7 November, 04:39

In active transport:

a. molecules move across the plasma membrane by crossing the lipid bilayer directly, rather than by using a transport protein.

b. the plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell.

c. no energy input is required from the cell.

d. a vesicle inside the cell fuses with the plasma membrane and releases its contents outside the cell.

e. molecules move across the plasma membrane against their concentration gradient.

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  1. 7 November, 06:30
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    The correct option is: e. molecules move across the plasma membrane against their concentration gradient

    Explanation:

    Active transport refers to the movement of the particles or molecules from higher concentration to lower concentration, across the plasma membrane of a cell. This transport requires cellular energy as the movement of the molecules is against the concentration gradient.

    Active transport can be divided into primary and secondary active transport.
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