[Campbell Biology P.36] What is the primary distinguishing characteristic between passive t... | Practice Question

What is the primary distinguishing characteristic between passive transport and active transport across a cell membrane, as described in the text?

  • A: Passive transport moves solutes against their concentration gradient, while active transport moves them with the gradient.
  • B: Passive transport involves the movement of water only, while active transport involves solutes.
  • C: Passive transport requires no energy investment, whereas active transport requires energy.
  • D: Passive transport is always aided by proteins, while active transport never is.

Explanation

CONCEPT 7.3 states that passive transport occurs 'with no energy investment', while CONCEPT 7.4 explicitly says 'Active transport uses energy to move solutes against their gradients' and highlights 'The Need for Energy in Active Transport'. This direct contrast in energy requirement is the primary distinguishing characteristic.