Biology 1201A Midterm: Biology Midterm Notes.pdf
11 Apr 2014
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Origins of life- cell biology. Compound light microscope: used the shortest wavelength of light to illuminate specimen, magnification: 1000 times (100x objective + 10x eyepiece) Semi- permeable plasma membrane: cytosol contained organelles, chromosomal genes dna, ribosomes (protein production) Cytoplasm: mainly water (80%), nucleic acids, proteins, lipids, carbs, pigments . Plastids: amyloplasts: store starch, chromoplasts: contain pigments, chloroplasts: site of photosynthesis. Cytoskeleton: network of fibers that make up the structure of the cell (mechanical support and cell shape) Animal cells microtubules, intermediate filaments, microfilaments. Plant cells - microtubules, intermediate filaments. *movement created by motor proteins (kinetochores) latching onto mt/mf/cell structure and walk along it. * dismantle and reassemble to change cell shape. Alone or in combo with. Interconnected web of fibers throughout cell. 2 rows of thin actin fibers wound in a spiral. Only in animal cells. Microscopic hollow tube made of tubulin. Move chromosomes during cell division. Act as tracks to guide motor proteins to organelles.
