alleryStart learning →What defines passive transport across a plasma membrane?
AThe cell must hydrolyse ATP to drive it
BThe cell expends none of its energy on it
CIt only moves water and never any solute
DIt always needs a carrier protein to occur
Answer & Solution
Correct answer: B. The cell expends none of its energy on it
1. Passive transport is a naturally occurring phenomenon that does not require the cell to exert any of its energy.
2. In passive transport, substances move from an area of higher concentration to an area of lower concentration.
3. Hydrolysing ATP to drive movement is the defining feature of active transport instead.
4. Osmosis moves only water, but it is one form of passive transport, not the whole of it.
_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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