Cell Biology Unit 1: Cell Signaling

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Last updated 6:14 AM on 9/10/26
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11 Terms

1
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how did robert hooke infer the existence of cells from cork?

under the microscope, the cork had a floor and ceiling plus four walls; only cell walls left bc they are dead

2
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the 3 tenets

  1. all organisms consist of one or more cells

  2. cell: basic unit of structure for all organisms

  3. cells only arise from cells


3
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chemical fixation

fix in place using chemicals to permanently preserve cell structure when it is dead (ex. formaldehyde)

4
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plant cell size

20 x 30μm

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animal cell size

20μm

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bacterium

1 × 2μm

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ribosome

25-30nm

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membrane

7-8nm

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microtubule

25nm

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microfilament

7nm

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DNA helix

2nm