Which of the following types of transport does not use metabolic energy and does not depend on a sodium gradient but is instead carrier mediated?
  1. Cotransport
  2. Countertransport
  3. Facilitated diffusion
  4. Primary active transport
Explanation
Answer: C - Facilitated diffusion is a passive process that does not use metabolic energy and does not depend on a sodium gradient. It is, however, carrier mediated.
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