Question 5 0.5 pts Transport of ions against their concentration requires the cell to expend ATP. Therefore, this type of transport is considered a type of passive transport. exocytosis. active transport. endocytosis.
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1. In contrast to passive transport, active transport requires energy for molecules to pass through cell membranes. 2. This might occur when molecules need to move against a concentration gradient, as is the case of thyroid cells where Iodine collects in large concentrations. 3. This type of transport requires both chemical energy in the form of ATP and carrier proteins. 4. Cells involved in this type of transport often have high numbers of mitochondria to facilitate this process.
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