The Cell

The Cell: A Review SD Jacinto Institute of Biology UP Diliman

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-unit membrane (7.5- 10 nm thick Selective barrier recognition & regulatory functions; channel transporter

Fluid mosaic model(Sanger and Nicholson) lipid bilayer, integral and peripheral proteins

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Large variety of hydrolytic enzymes for cytoplasmic digestion- ribonucleases, deoxyribonucleases, lipases, active at low pH Found in all cells; abound in phagocytic cells Types- primary, secondary

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Ribosomes and Protein synthesis

Polyribosome

Present in all eukaryotic cells; transforms chemical energy of metabolites into ATP Found in cytoplasmic areas with intense metabolic activity, oriented along axis of cell First mitochondria probably originated from prokaryote; multiply by fission

The Peroxisomes  For fatty acid oxidation  Has

oxidases for this purpose; produces H2O2 in the process

 Has catalases to convert H2O2 into

H20 and O2 (aberration associated with peroxisome malfunction-basis for movie Lorenzo’s oil)

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The vacuole: Its functions Removes unwanted structural debris Isolates materials that might be harmful to the cell Contains waste products Maintains internal hydrostatic pressure (turgor pressure) within the cell Maintains an acidic internal pH

Expor ts unwanted substances from the cell. Enables the cell to change shape

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That’s all …