lesson overview lesson overview cell structure biology what is needed for something to be biotic?...
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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?
Lesson Overview Cell Structure
Discovery of Cells
Robert Hooke – 1665
Lesson Overview Cell Structure
Anton van LeeuwenhoekSchleiden and SchwannRudolf Virchow - 1855Cell theory
All living thingsBasic unitsProduced from existing cells
Lesson Overview Cell Structure
Types of CellsSimilaritiesProkaryotes
BacteriaDNA is freeSmallerSimpler
Archaea
ProkaryoteSlight differences
Extremophile
Bacterial cell
Animal cell
Lesson Overview Cell Structure Eukaryotes
Enclosed DNALargerMore complexPlants, animals, fungi…
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
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
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?
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
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
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
Lesson Overview Cell Structure
Membrane (Channel) Proteins
• Go across the layers• Proteins are specific
• Only allow certain molecules through• Complex shapes
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
Lesson Overview Cell Structure
Lesson Overview Cell Structure
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?
Lesson Overview Cell Structure
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
Lesson Overview Cell Structure