BIOLOGY 1A Lecture Notes - Lecture 3: Cell Fractionation, Organelle, Phagocytosis
Document Summary
How do we study cells: though usually too small to be seen by the unaided eye, cells are complex, microscopes and the tools of biochemistry have revealed many aspects of cell biology. Microscopy: scientists use microscopes to visualize cells too small to see with the naked, the quality of an image depends on eye. In a light microscope (lm), visible light passes through a specimen and then through glass lenses, which magnify the image. Magnification, the ratio of an object"s image size to its real size. Resolution, the measure of the clarity of the image, or the minimum distance of two distinguishable points. Contrast, visible differences in parts of the sample. Comparing prokaryotic and eukaryotic cells: basic features of all cells: Dna in an unbound region called the nucleoid. Cytoplasm bound by the plasma membrane: eukaryotic cells have: Dna in a nucleus that is bounded by a membranous nuclear envelope. Cytoplasm in the region between the plasma membrane and nucleus.
