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Mar 2710:59 a.m.
Starter:
What is Active transport? Give an example
May 1612:14 p.m.
Starter: Show the direction of water movement
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Mar 267:42 p.m.
Passive and Active Transport
Osmosis
Mar 2711:14 a.m.
Brainpop - Active Transport
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Active Transport
• Requires energy to move materials UP their concentration gradient, from an area of lower concentration to an area of higher concentration.
• The opposite direction for diffusion.
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Transport Proteins• Substances are moved molecule by
molecule.
• It is similar to facilitated diffusion except that cell energy (ATP) is used in the
process.
ATP = Adenosine Triphosphate
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Salt ion
Cell membrane
Transport protein
Ion binds to thetransport protein
The transport protein turns over and releases the iononto the inside of the cell, against the concentration gradient
Concentrationgradient
Energy is used
May 157:45 p.m.
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Two Types of Endocytosis• Pinocytosis = Cell drinking transport of solvents or fluids
• Phagocytosis = Cell eating movement of large particles or whole cells. (Many unicellular organisms feed by phagocytosis)
• Phagocytes = cells like white blood cells, which use phagocytosis to ingest bacteria and viruses that invade the body. Lysosomal enzymes then digest the invaders before they cause harm.
Mar 267:42 p.m.
Exocytosis
• The reverse of endocytosis
• Vesicles in the cell fuse with the membrane and release contents to the outside.
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Mar 267:42 p.m.
Cell Membrane Pumps(Carrier proteins that assist in active
transport)
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May 179:58 a.m.
What is the exam on?
3 Papers in 2 hours
1. Ecology2. Diversity of Animals
3. Cell Structure and function (cell parts and unicellular only)
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Jun 222:33 p.m.
Baseline Quiz!
Jun 222:39 p.m.
Home LearningYou are to design a 17 word crossword on this unit.
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(a) Describe ONE similarity (other than size) in the structure of these two cells for absorbing materials.
(b) Explain how this similarity affects how these cells absorb materials.
(c) Osmosis and active transport are both processes used by cells. Compare and contrast these two processes.
Plant Cell: Root Hair
Animal Cell: Small Intestine
Past Paper Question:
Mar 2712:05 p.m.
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Jun 223:06 p.m.
Structure and Functions!
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Jun 223:13 p.m.
Jun 223:13 p.m.
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