INTRODUCTION
CELL STRUCTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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big
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small
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crunchy
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water
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Detailed explanation-1: -If a substance must move into the cell against its concentration gradient, that is, if the concentration of the substance inside the cell must be greater than its concentration in the extracellular fluid, the cell must use energy to move the substance.
Detailed explanation-2: -1 Answer. Active transport requires energy because it is not a passive process. The molecule has to go against the concentration gradient. Hence it requires energy to be carried by the carrier proteins.
Detailed explanation-3: -Active transport is the energy-requiring process of pumping molecules and ions across membranes against a concentration gradient.
Detailed explanation-4: -There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.