Active transport is necessary for cells because sometimes molecules need to move from low to high concentrations.
Why is active transport necessary for cells?
- Active transport is very necessary for cells because this process enables cells to accumulate molecules or ions from the environment against the concentration gradient.
- The cellular membrane prevents large molecules from moving across freely, but there are still times when a cell needs to move substances in or out across the membrane.
- If the substance is moving down the concentration gradient the cell can use passive transport, but if it is moving against the gradient the cell must use active transport because it would require energy to do so.
- Conversely, the contents of cells heavily with electrolytes or metabolic products can be excreted against the concentration gradient.
So, the correct answer is option C. sometimes molecules need to move from low to high concentrations.
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