SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Substances are moving rapidly across the cell membranes.
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ATP is being rapidly consumed near the cellular membrane.
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Substances are moving from high to low concentrations.
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Substances are moving through channels in the cell membrane.
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Detailed explanation-1: -Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane? A lot of ATP is being used up near the cellular membrane. Substances are moving through proteins in the cell membrane.
Detailed explanation-2: -Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.
Detailed explanation-3: -Active transport requires energy for the movement of molecules whereas passive transport does not require energy for the movement of molecules. In active transport, the molecules move against the concentration gradient whereas in passive transport, the molecules move along the concentration gradient.