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Microscopes + Cells (TEM (They can only be used on thin specimens., They…
Microscopes + Cells
TEM
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They use electromagnets to focus a beam of electron, which is then transmitted through the specimen.
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SEM
The SEM scans a beam of electrons across the specimen. This knocks off electrons from the specimen, which are gathered in a cathode ray to form an image.
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Optical Microscopes
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They have a maximum resolution of about 0.2 micrometres. This means that you can't see organelles like ribosomes or endoplasmic reticulum, etc.
It can be used to see living organisms no matter the thickness meaning it is better, in that sense, compared to the electron microscopes.
General Cell stuff
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The supernatant is made up of the lighter cells hilt the heaviest organelle goes to the bottom of the tube to form a thick sediment, called a bullet.
In binary fission the main DNA loop can only be replicated once, however, the plasmids can be replicated many times.