Biology 1201A Lecture Notes - Muscle Contraction, Ultrastructure, Centrosome
4 Nov 2012
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Document Summary
Lowest hierarchical level, basic unit of life, performs all functions. Virus= in every organism, highly specific to host, reproduce on when enter a cell. Prokaryotic visibile components: plasma membrane, ribosomes, nucleiod, cytoplasm. Eukaryotic visible components: membrane bound organelles, nucleus everything. Nucleus: contains most of the genes in e double membrane, pores allow molecules to pass through nuclear side of envelope is lined by lamina(a network of intermediate filaments, maintains shape) Dna and associated proteins are organized into fibrous material chromatin, chromatin fibres coil up called chromosomes. Fibres and granules adjoining chromatin, the nucleolus rrna synthesized, and ribosomal subunits are made. Cell geography (2 lectures) nucleus directs protein synthesis using mrna. [[if there are more nucleus and ribosomes in a cell=a lot of protein activity]] Cytoplasm: made up of: water, nucleic acid, proteins, lipids, carbs, pigments, etc . Cytosol=liquid part, cytoplasm=liquid part when organelles are in it. Free ribosomes are suspended in cytosol, synthesize proteins that function within cytosol.
