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KEY CONCEPT Materials move across membranes because of concentration differences.

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KEY CONCEPT Materials move across membranes because of concentration differences.

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  1. The student is expected to:4B investigate and explaincellular processes, includinghomeostasis, energy conversions,transport of molecules, andsynthesis of new molecules and 9A compare the structures andfunctions of different types ofbiomolecules, includingcarbohydrates, lipids, proteins, and nucleic acid

  2. KEY CONCEPT Materials move across membranes because of concentration differences.

  3. Diffusion and osmosis are types of passive transport. • Passive transport does not require energy input from a cell. • Molecules can move across the cell membrane through passive transport. • There are two types of passive transport. • diffusion • osmosis

  4. Diffusion and osmosis are types of passive transport. Diffusion • Diffusion is when molecules move down a concentration gradient. • Movement is from a region of higher concentration to a region of lower concentration.

  5. Diffusion and osmosis are types of transport. Osmosis • Osmosis is the diffusion of water molecules across a semipermeable membrane.

  6. Diffusion and osmosis are types of transport. • There are three types of solutions. • isotonic • hypertonic • hypotonic

  7. Some molecules can only diffuse through transport proteins. • Some molecules cannot easily diffuse across the cell membrane. • Facilitated diffusion is diffusion through transport proteins.

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