BIOL 1003 Lecture Notes - Nuclear Membrane, Cell Wall, Radiant Energy
16 Jan 2013
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Document Summary
Magnification increases the size of an object. Resolution/resolving power ability to distinguish between adjacent points. Beams of electrons are reflected off specimens surface. Made up of cellulose fibres which provide strength. Cell does not burst if surrounding solutions become dilute. Contains chromosomes (genes made of dna which control cell activities) Separated from the cytoplasm by a nuclear envelope. The envelope is made of a double membrane containing small holes. These small holes are called nuclear pores (100nm) Nuclear pores allow the transport of proteins into the nucleus. Have ribosomes attached to the cytosolic side of their membrane. Found in cells that are making proteins for export (enzymes, hormones, structural proteins, antibodies) Modifies proteins by the addition of carbohydrates, removal of signal sequences. Have no ribosomes attached and often appear more tubular than the rough er. Necessary for steroid synthesis, metabolism and detoxification, lipid synthesis. Small organelles often attached to the er but also found in the cytoplasm.
