A substance crosses a cell membrane through a specific carrier protein, moving from an area of higher concentration to an area of lower concentration without using cellular energy. Which process is occurring?
Correct answer: A. Facilitated diffusion
- A. Facilitated diffusion
- B. Primary active transport
- C. Phagocytosis
- D. Exocytosis
Explanation
Facilitated diffusion uses a membrane channel or carrier to move a substance down its concentration gradient without ATP. Active transport moves substances against a gradient, while phagocytosis and exocytosis involve vesicles.
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About Cells and Tissues
Cells and tissues covers cell membranes, cytoplasm, organelles, cell division and the transport of substances into and out of cells. It also explains the four basic tissues, epithelial, connective, muscular and nervous, including their structure, functions and locations, with a distinction between tissue organization and organ structure.
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