Aim: How has the electron microscope enabled scientists to see the unseen?
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Transcript of Aim: How has the electron microscope enabled scientists to see the unseen?
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Aim: How has the electron microscope enabled scientists to see the unseen?
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Living Environment HW#10Due Friday 10/8
• Read text pages 184-189
• Pg 186 word origins – answer question
• Pg 186 draw diagram –answer predicting question under fig. 7-18
• Read – How does penicillin work? Summarize and come up with two questions for further research.
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Differences between compound, and electron microscopes
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Difference in images
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The cell membrane helps the cell maintain Homeostasis
Lipid bilayer
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Structure of the cell membrane
Outsideof cell
Insideof cell(cytoplasm)
proteinsCell membrane
Protein channel
Lipid bilayer
Carbohydrate
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antibiotics that interfere with cell wall synthesis have a high specificity and are low in toxicity to host
organisms
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Tagged carbohydrate on the surface of the cell membrane
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Aim: How do substances diffuse through a membrane?
Things that move into a cell…
Things that move out of a cell…
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Diffusion – molecules of a substance move from areas of higher concentration to areas
of lower concentration
Water molecules
Sugar molecules
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Facilitated diffusion
Outsideof cell
Insideof cell(cytoplasm)
proteinsCell membrane
Protein channel
Lipid bilayer
Carbohydrate
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Active Transport requires energy
A
B
A molecule is moving across the cell membrane from an area of low concentration with the help of a transport protein
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Large molecules pass through the cell membrane by endocytosis and exocytosis
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Do Now Summary
Plasma Membranes are Selectively Permeable
• What does this mean?
• What are the ways in which substances can pass through a cell membrane