alleryStart learning →In passive transport, in which direction does a substance move?
AFrom lower to higher concentration
BFrom inside the cell to outside only
CFrom higher to lower concentration
DIn whichever direction ATP dictates
Answer & Solution
Correct answer: C. From higher to lower concentration
1. In passive transport, substances move from an area of higher concentration to an area of lower concentration.
2. This is movement down the concentration gradient, and it needs no cellular energy.
3. Movement from lower to higher concentration runs up the gradient, which is what active transport must pay for.
4. Direction is set by the gradient itself, not by the cell or by ATP, so the last option misplaces the driver.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_
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