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FLT Describe active transport. • Distinguish among endocytosis ,

FLT Describe active transport. • Distinguish among endocytosis , phagocytosis , and exocytosis. MAIN IDEAS • Proteins can transport materials against a concentration gradient. • Endocytosis and exocytosis transport materials across the membrane in vesicles.

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FLT Describe active transport. • Distinguish among endocytosis ,

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  1. FLT • Describe active transport. • • Distinguish among endocytosis, • phagocytosis, and exocytosis.

  2. MAIN IDEAS • • Proteins can transport materials against a • concentration gradient. • • Endocytosis and exocytosis transport materials across the membrane in vesicles.

  3. 3.5 Active Transport, Endocytosis, and Exocytosis KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane. 1 3 Power Notes 4 2

  4. 3.5 Active Transport, Endocytosis, and Exocytosis Active transport requires energy input from a cell and enables a cell to move a substance against its concentration gradient. • Passive transport requires no energy from the cell. • Active transport is powered by chemical energy (ATP). • Active transport occurs through transport protein pumps. • Cells use active transport to maintain homeostasis.

  5. Power Notes • Active transport: • drives molecules across a membrane from lower to higher concentration • (against a concentration gradient)

  6. 3.5 Active Transport, Endocytosis, and Exocytosis A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. • Cells use energy to transport material in vesicles. • Endocytosis is the process of taking material into the cell. • Phagocytosis is a type of endocytosis.

  7. Power Notes • Endocytosis: process of taking in liquids or larger molecules into a cell by engulfing in a • vesicle; requires energy

  8. Power Notes • Endocytosis: process of taking in liquids or larger molecules into a cell by engulfing in a vesicle; requires energy

  9. 3.5 Active Transport, Endocytosis, and Exocytosis A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. • Cells use energy to transport material in vesicles. • Exocytosis is the process of expelling material from the cell.

  10. Power Notes • Exocytosis: process of releasing substances out of a cell by fusion of a vesicle with the • membrane

  11. How do endocytocis and exocytosis differ from difussion? They require energy input; diffusion des not. They also enable lager particles to enter a cell, particles that are too large to diffuse across a cell membrane.

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