Active transport moves molecules from and to which concentration? A: high to low
B: low to high
C: low to lower

Option (B) low to high is right Answer

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We know that, Active transport moves ions and molecules across a membrane against the concentration gradient. It requires energy.

The characteristic features of active transport are:

-The movement of molecules in case of active transport is from lower concentration to higher concentration so it shows uphill transport.

-These have carrier proteins that are highly specific like enzymes for the substances to be carried across the membrane.

-The process of active transport can be inhibited by inhibitors that react with the protein side chains.

-The transport rate reaches its maximum when all the protein carriers are in use or get saturated with the substances to be carried.

The various types of processes that depend on active transport are:

-Absorption of amino acids from the gut.

-Absorption of mineral ions by plant roots.

-Excretion of urea and hydrogen ions by the mammalian kidney.

-Exchange of sodium and potassium ions in nerve cells.

-Filling of the contractile vacuole in amoeba.

The phloem in the leaves of a plant is rich in sugars because of the high rate of active transport.

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