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21 Cards in this Set
- Front
- Back
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10 ^ 14 cells |
approx. How many cells are there in the human body? |
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10-20% |
What percentage of the cells in our body are human cells? |
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1.) magnification 2.) resolving powers 3.) contrast |
The important characteristics of a microscope are |
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Magnification |
Is the ratio of the image of the specimen to the specimen's actual size |
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Resolution |
The measure of clarity of the image. It has the ability to separate objects or parts of objects |
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Wavelength of the visible light |
How is the limit of the resolution determined? |
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Contrast |
Accentuates differences in parts of the sample |
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-The visible light passes through the specimens and then through glass lenses -The glass lenses refract the light, making the image of the specimen larger as it hits your eye. |
How do light Microscopes work? |
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The electron microscope uses an electron beam instead of light and the electron microscope also uses a magnetic lens instead of glass lenses |
What is the difference between an Electron and light microscope? |
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Transmission electron microscopy- used to see internal structures |
What is it called when the electron beam is focused through the specimen? |
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Scanning electron microscopy- used to see surface details |
What is it called when the electron beam is focused across the surface of the specimen? |
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Prokaryotic cells |
Bacteria and Archaea have this type of cells |
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Eukaryotic cells |
Protists, Fungi, animals, plants have these types of cells |
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Prokaryotes have nuceloids not enclosed by a membrane and eukaryotic have nuclei |
Differences between Prokaryotes and Eukaryotic cells |
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Plasma Membrane |
A lipid membrane that surrounds each cell and acts as a semi-permeable barrier to keep the contents of the cell from floating away. |
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Cytoplasm |
In Eukaryotes, said to be the part of the cell between the plasma membrane and the nucleus |
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Cytosol |
The semi-fluid part of the cytoplasm |
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Nucleus |
Surrounded by a double membrane known as the nuclear envelope |
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Pore Complex |
The protein pores that line the nucleus |
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Chromatin |
Chromosomes are made up of this. It is also DNA + protein |
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In the nucleus |
Where is messenger RNA made? |
