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Lesson Overview Lesson Overview Cell Structure Biology What is needed for something to be biotic?...
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![Page 1: Lesson Overview Lesson Overview Cell Structure Biology What is needed for something to be biotic? – Cells – Genetic code – Grow, develop, reproduce – Respond.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697c0271a28abf838cd5fbe/html5/thumbnails/1.jpg)
Lesson Overview Cell Structure
Biology
What is needed for something to be biotic?CellsGenetic codeGrow, develop, reproduceRespondHomeostasisChange over time
Video – Jot down what the following people did?Aton vanLeeuwenhoekRobert HookeSchleidenSchwannVirchowWhat are the 3 parts of cell
theory?
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Lesson Overview Cell Structure
Discovery of Cells
Robert Hooke – 1665
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Lesson Overview Cell Structure
Anton van LeeuwenhoekSchleiden and SchwannRudolf Virchow - 1855Cell theory
All living thingsBasic unitsProduced from existing cells
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Lesson Overview Cell Structure
Types of CellsSimilaritiesProkaryotes
BacteriaDNA is freeSmallerSimpler
Archaea
ProkaryoteSlight differences
Extremophile
Bacterial cell
Animal cell
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Lesson Overview Cell Structure Eukaryotes
Enclosed DNALargerMore complexPlants, animals, fungi…
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Lesson Overview Cell Structure
Why are cells important?
• Bodies are made of cells• Cells Tissues Organs Bodies
• 3 main jobs• Make energy• Make proteins• Make more cells
• Organelles• Do the work
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Lesson Overview Cell Structure
Observation of Cells Lab- Take a very thin slice of onion and observe under a
microscope- Draw a diagram of what you see, try to get one cell - Label any known structures and the observation
magnification- Take a small scraping of cheek cells and observe under
a microscope- Draw a diagram of what you see, try to get one cell- Label any known structures and the observation
magnification- Homework: Complete labeling assignment sent to
you as a Google Form
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Lesson Overview Cell Structure
Daily Review #1
1. What is the difference between prokaryotes, eukaryotes and archaea?
2. Why does an organism need cells?
3. What are the 3 parts of cell theory?
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Lesson Overview Cell Structure
Cell (Plasma) Membrane• Boundary
• Separate inside from outside• Transport materials
INfood- sugars- proteins- fats
saltsO2
H2O
OUTwaste- ammonia- salts- CO2
- H2O products- proteins
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Lesson Overview Cell Structure
Make a Cell Membrane
• Need something to separate from water
• Phospholipids• Head (phosphate) –
hydrophilic• Tails (lipids) –
hydrophobic• Bilayer
• Embedded proteins• Fluid mosaic
• Exterior carbohydrate chains
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Lesson Overview Cell Structure
Semi-Permeable Membrane
inside cell
outside cell
lipid
waste
• Control what gets in and out• Protection• Import nutrients• Export products and
waste• Allows some material to get
in and out• Some things move freely
• Fats• Oils
• Other things need “doors”• Membrane proteins
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Lesson Overview Cell Structure
Membrane (Channel) Proteins
• Go across the layers• Proteins are specific
• Only allow certain molecules through• Complex shapes
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Lesson Overview Cell Structure
Diffusion• Move from high to low concentration
• Trying to even things out• Why molecules will move across the membrane through
proteins• Type of passive transport
• No energy used
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Lesson Overview Cell Structure
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Lesson Overview Cell Structure
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Lesson Overview Cell Structure
Daily Review #24. Why is a cell membrane
considered a
a) Bilayer?
b) Fluid mosaic?
c) Semi-permeable?
5. Why do cells need cell membranes?
6. What will happen in the picture to the right and why?
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Lesson Overview Cell Structure
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Lesson Overview Cell Structure
Active Transport
• Requires energy (ATP)
• Uses special membrane proteins (pumps)
• Moves against the concentration (uphill)• Low to High
• Why?• Need even more
inside than there is• Na and K
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Lesson Overview Cell Structure