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14 Cards in this Set
- Front
- Back
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What is the maximum magnification and resolution of a light microscope?
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Magnification - x1500
Resolution - 200nm |
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What is the approximate diameter of a ribosome?
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20nm
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What is the role of a microfilament and give an example?
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Movement of cell from inside.
e.g. phagocytes engulfing pathogens, single cell organisms moving towards food, cytokinesis. |
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How do bacteria divide?
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By binary fission.
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Give four examples of useful prokaryotes.
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-Cheese and yoghurt production.
-Digestion and vitamin K production in digestive system. -Skin is covered in prokaryotes to keep pathogens out. -Sewage treatment. |
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Give three roles of membranes.
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-Separating cell contents from outside.
-Separating cell components from cytoplasm. -Cell recognition and signalling. -Holding components of metabolic pathways in place. -Regulating the transport of materials in or out of cells. |
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What is the thickness of a membrane?
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7-10nm
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How are cell surface membranes used in plant shoots?
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They contain receptors that allow them to detect molecules that regulate growth.
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How does increased temperature affect membranes?
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The higher the temperature, the greater the kinetic energy, the more fluid the membrane. This makes it leaky.
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Define cell signalling.
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Communication between cells by signals.
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Give an example of a cell signal.
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Cytokines
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What is endopinocytosis?
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Bulk transport of liquid material into a cell.
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Define solute.
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A substance that dissolves in a liquid.
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Order the stages of mitosis.
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Interphase
Prophase Metaphase Anaphase Telophase |
