Topic 2: Cells (2.1-2.3

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IB diploma Biology Flashcards on Topic 2: Cells (2.1-2.3, created by juliaevaelin on 02/10/2015.
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2.1.1 Outline the cell theory - All cells come from pre-existing cells - Cells are the smallest unit of life - All living things are composed of cells
2.1.2 Discuss evidence for the cell theory Louis Pasteur did experiments on chicken broth with one container open and one closed, the open grew bacteria -> cells cannot be created from a vacuum.
2.1.3 State the functions all unicellular organisms must carry out. Unicellular organisms carry out the functions of life: - metabolism, growth, reproduction, response, homeostasis, nutrition
2.1.4 Compare relative sizes of molecules, cell membrane thickness, viruses, bacteria, organelles and cells using the appropriate SI-unit. From largest to smallest: cells (>100 microm) organelles (>10 microm) bacteria (>1microm) viruses (>100 nm) membrane thickness (>10 nm) molecules (1nm)
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