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Transcript
Ch. 6: Tour of the Cell
Spanning many things, including...FLAGELLA!!!
Let's get Started
1st thing's first; how do you see the cell?
Well, a microscope would be a good idea...
But what kind of microscope?
Well, there's a light microscope:
Used by Renaissance scientists, the light microscope is able to shine light beams through objects, rendering them visible.
But there are loads of other microscopes as well; take, for instance, the Scanning Electron Microscope.
- The SEM shoots a beam of excited electrons at the surface of the specimen, exciting the surface electrons of that specimen and allowing the SEM to detect those electrons, painting a picture of the topography, or top layer, of the specimen
Or what about a TEM?
TEM uses a dye stained with heavy metals, that changes thedensity of certain organelles, allowing the microscope to detect the inner workings of the cell. Cool, huh?
Now that we know how we see something...
What exactly do we see?
Well, depends on the organism!!!
We have Eukaryotes and Prokaryotes; we'll start with prokaryotes seeing as they're so...simple. =)
- We have a capsule, which is made of stuff that really we don't care about, proteins and such I suppose.
- Then a cell wall, made of...well, cell wall stuff.
- Then a plasma membrane, the good stuff. Composed of a phospholipid bilayer (which is made of usual phospholipids and things, and studded with transport proteins.
- Then there's the cytoplasm, which doesn't contain much, considering its a prokaryote. Some ribosomes, some floaty stuff, and a nucleoid (which is a nuclear space-place, which contains circular chromosomal DNA.
- Also some Pillae and bacterial flagella, which help with cell movement.
And now the awesome stuff; eukaryotic cells!!!!!
Plant cells are the same, except they have
- chloroplasts (sight of photosynthesis)
- A central vacuole (which contains nutrients and crap)
- A cell wall (kinda self-explanatory)
- And plasmodesmota (like gap junctions, except...not.