Which process moves a substance across a cell membrane from a lower concentration to a higher concentration?
Correct answer: D. Active transport
- A. Osmosis
- B. Simple diffusion
- C. Facilitated diffusion
- D. Active transport
Explanation
Active transport moves substances against their concentration gradient and requires cellular energy, usually ATP. Diffusion and facilitated diffusion move substances down the concentration gradient, while osmosis specifically concerns water.
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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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