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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Advantages of light microscope |
Colour images produced Observe living cells |
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Disadvantages of light microscopes |
Long light wavelength means lower resolution |
0.2um max resolution |
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Advantages of electron microscope |
Electrons have a short wavelength so greater resolving power Electrons are negatively charged so can be focused by an electromagnet |
Max resolution 0.1nm |
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Disadvantages of electron microscopes |
Sample needs to be in a vacuum so only dead organisms can be observed Black and white images produced Due to preparation method artefacts may be produced |
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What is the definition of resolution? |
The ability to distinguish between two separate points |
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Advantages of TEM |
Highest resolution |
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Disadvantages of TEM |
Can't observe living organism as it's in vacuum Complex preparation method Thin specimens only May contain artefacts |
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Advantages of SEM |
Sample does not need to be as thin as SEM 3D images produces |
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Disadvantages of SEM |
Lower resolving power than TEM |
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What is the function of the nucleus? |
Controls cell activities Contains DNA Controls production of mRNA tRNA ribosomes and protein synthesis |
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Nuclear envelope |
Double membrane Controls entry and exit of substance into nucleus |
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Nuclear pores |
Allows large molecules such as mRNA out of nucleus |
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Nucleoplasm |
Jelly like cytoplasm of nucleus |
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Chromosomes |
Consists of DNA associated with histones |
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Nucleolus |
Manufactures RNA and assembles ribomes |
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