Cells

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Created by: ftpptf
Created on: 05-03-16 17:49

Light rays focused by lenses.

Light microscope

1 of 10

Very small single celled organism, no nucleus and no membrane-bound organelles.

Bacteria

2 of 10

Beam of electrons focused by electromagnets.

Electron microscope

3 of 10

Minimum distance apart 2 objects must be in order for them to appear as separate items.

Resolving power

4 of 10

Specimen coated with thin film of heavy metal - Electron beam scanned to and fro across specimen - Electrons that are reflected from surface are collected and produce image on viewing screen.

SEM

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The basic units of living organisms.

Cells

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The ability to distinguish between 2 close objects.

Resolution

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Form vast majority of living organisms including plant and animal cells.

Eukaryotes

8 of 10

False images arising from poor technique.

Artefacts

9 of 10

Beam of electrons fired through specimen - Specimen must be thin and stained using electron dense substance - Electron dense substance deflects electrons in beam and pattern remaining e- produce as they pass through specimen is converted to image.

TEM

10 of 10

Other cards in this set

Card 2

Front

Very small single celled organism, no nucleus and no membrane-bound organelles.

Back

Bacteria

Card 3

Front

Beam of electrons focused by electromagnets.

Back

Card 4

Front

Minimum distance apart 2 objects must be in order for them to appear as separate items.

Back

Card 5

Front

Specimen coated with thin film of heavy metal - Electron beam scanned to and fro across specimen - Electrons that are reflected from surface are collected and produce image on viewing screen.

Back

View more cards

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Cells