1 ACTIVE TRANSPORT ACROSS A MEMBRANE. Overview of Active Transport Active Transport 1. Carrier Protein 2. Endocytosis3. Exocytosis.

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Presentation transcript:

1 ACTIVE TRANSPORT ACROSS A MEMBRANE

Overview of Active Transport Active Transport 1. Carrier Protein 2. Endocytosis3. Exocytosis

Active Transport - Single Molecules 1. Carrier Protein: same as facilitated diffusion, but cell energy used to move molecule across membrane against the concentration gradient (from low to high) lower concentration outside higher concentration inside

Active Transport Steps: 1. Solute (i.e. amino acid, vitamin, glucose) binds to carrier protein. 2. Carrier protein uses energy (ATP) to flip over & releases solute molecule to other side of the membrane. 3. Carrier protein flips back to get another solute molecule. LOW CONCENTRATION HIGH CONCENTRATION

Active Transport - Bulk Transport 2. Endocytosis (two types): phagocytosis: (cell eating) large particles, whole cells or solids enter the cell enter as a food vacuole pinocytosis: (cell drinking) bulk transport of dissolved solutes or fluids into the cell enter as a vesicle Note: In both processes, the cell membrane wraps around the material being brought into the cell.

Bulk Transport - Phagocytosis food particle cell membrane food vacuole

Active Transport 3. Exocytosis: bulk transport of solutes or fluids out of the cell

Bulk Transport - Exocytosis This diagram is showing the same process as the last slide.

Cell Transport Overview Single Molecules facilitated diffusion protein channel

Video

Homework page 71 # 1 – 6