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Name __________________ BioPreAP/GT Cells vs. Viruses 3.1 Cell Theory Discovery of Cells In 1665, what did Robert Hooke, look at, what term did he use to describe them, and why? What was Anton van Leeuwenhoek observing when he was looking at a drop of pond water under a microscope? Cell Theory Discuss what each scientist concluded about cells. *Matthias Schleiden: *Theodor Schwann: *Rudolf Virchow: These discoveries, confirmed by the biologists are summarized in the cell theory, a fundamental concept of biology. The cell theory states: 1. 2. 3. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells T or F All cells are the same size. What are the characteristics that all cells have in common? Cells fall into two broad categories depending on? Compare prokaryotic and eukaryotic cells: Comparison Table for Prokaryotes and Eukaryotes Prokaryotic Cells Eukaryotic Cells Contain a nucleus Does not contain a nucleus Genetic material not separated from the rest of the cell Genetic material is separated from the rest of the cell Presence of cytoplasm Presence of membrane bound organelles Single celled Multicellular 18.1 Viruses What is a virus? Are viruses alive? Explain your answer How are viruses similar to cells? What is the only way a virus can reproduce? 18.2 Viral Structure The structure of viruses What are the two main parts of a virus? T or F Virus capsids all have the same shape. In some viruses, the capsid itself is surrounded by a __________ ____________. Explain what this structure is. How do viruses attach to host cells? What must viruses do in order to reproduce? What plays an important role in how viruses work? How does a virus identify its host? In contrast to prokaryotes and eukaryotes, in which DNA is always the main genetic material, a virus can have either __________ or __________ but never ___________. Viruses that infect bacteria are called ________________________. How do viruses that infect eukaryotes differ from bacteriophages in their method of entering the host cell?
