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Cellular Biology. Lecture #3 NatSci II Josephine B. Guerrero, MD Asst. Professor, Department of Biology. History of the Discovery of the Cell. Anton von Leeuwenhoek – invented the microscope Robert Hooke – saw cells in cork Mathias Schleiden – all plants made of cells
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Cellular Biology Lecture #3 NatSci II Josephine B. Guerrero, MD Asst. Professor, Department of Biology
History of the Discovery of the Cell • Anton von Leeuwenhoek – invented the microscope • Robert Hooke – saw cells in cork • Mathias Schleiden – all plants made of cells • Theodore Schwan – all animals made of cells • Rudolph Virchow – cell comes from cells
Cell Theory • The cell is the unit of structure of living things. • The cell is the unit of function of living things. • Cells come from pre-existing cells. • Cells contain hereditary materials through which traits are passed on from parent to daughter cells.
Cell Diversity • Size – small vs. large cells • Shape/form – squamosal, cuboidal, columnar, spindle shaped, elongate, globose • Functions – epithelial, connective, muscular, nervous, reproductive • Complexity – prokaryotes vs. eukaryotes
Function of cell organelles • Cell membrane – selective permeability • Cell wall – structural integrity • Nucleus – house the cell’s DNA • Ribosomes – assist in protein synthesis • Endoplasmic reticulum – transport • Golgi complex - packaging • Mitochondria – site of respiration process
Function of cell organelles • Chloroplast – site of photosynthesis • Vacuoles – storage of materials • Lysosomes – contains acids/enzymes • Microtubules – cytoplasmic movements • Cilia and flagella - motility • Centrioles – assist in cell division process
