Question

1) When would a cell use Active Transport? Mark all that apply.

-When the cell needs to move a compound down its concentration gradient.

-When the cell needs to move a compound against its concentration gradient.

-When the cell needs to move a polar compound.

-When the cell needs to move a nonpolar compound.

-When the cell needs to move an ion.

2) When would a cell use Passive Transport? Mark all that apply.

-When the cell needs to move a compound that cannot move freely through the membrane.

-When the cell needs to move a compound against its concentration gradient.

-When the cell needs to move a compound down its concentration gradient.

Answer 1

Answer 1):-

"A cell uses active transport, when the cell needs to move a compound against its concentration gradient". This type of movement of compounds using active transport requires energy (in the form of ATP) and enzymes.

An example of active transport is the Na⁺- K⁺ pump.

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Answer 2):-

"​​​A cell uses passive transport, when the cell needs to move a compounds down its concentration gradient". No energy (ATP) is required during passive transport because during passive transport the entropy of the system increases.

There are various forms of passive transport :- simple diffusion , facilitated diffusion and osmosis.

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