Biology 1001A Study Guide - Midterm Guide: Spruce Budworm, Cell Membrane, Protein Structure

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Characteristics of viruses and why they are not generally considered to be alive . Viruses are made of one or more nucleic acid molecules surrounded by a protein coat. Some of the protein coat may be enclosed within a envelope. Viruses have two common structures: helical(protein in a rodlike structure, infect plant cells)and polyhedral(coat in triangle units, infect animals, plants, bacteria). Viruses have genes encode at least in their coat proteins. Viruses cannot reproduce on their own, since they are lack of a metabolic system and mobility. Viruses do not considered alive but as infectious particles since they don"t have cytoplasm enclosed by plasma membrane. Why viral infections are usually dif cult to treat with drugs, and exceptions to this general principle. Since viruses are hidden inside the host cell and use its machinery to replicate. While killing the viruses, it is dif cult to only destroy the viruses without destroy the machinery of the host cell.

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