THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It requires energy
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It requires carrier
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It requires a concentration gradient
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All of the above statements are true
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Detailed explanation-1: -Active transport occurs across the plasma membrane against the concentration gradient from their lower to higher concentration. It requires ATP. So it is an energy dependent process.
Detailed explanation-2: -During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
Detailed explanation-3: -Active transport is the transport of molecules that require the use of energy, in the form of an energy-storing chemical called ATP (adenosine triphosphate) to help them cross the cell membrane.
Detailed explanation-4: -Active transport requires a specialized carrier molecule, a protein, and the expenditure of cellular energy; transfer across membranes can therefore occur against a concentration gradient.
Detailed explanation-5: -So, the correct answer is ‘It pumps out 3 Na+and pumps in 2 K+ ‘