viruses - (b Makes virus more susceptible to chemical...

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VIRUSES CHARACTERISTICS : A. Cell type - eukaryotic, prokaryotic ? B. Acellular C. Obligate intracellular parasites D. Nonliving ? Living ? E. Kingdom ? VIRAL STRUCTURE A. Size : 1. Measured in nanometers (nm.) 2. 1000 nm = 1 μ m 3. Average range in size : 20 nm to 300 nm B. Structure : 1. Core a. DNA or RNA b. Contains genetic information 2. Capsid a. Outer protein coat b. Functions 1). Protects core 2). Shape of the virus 3). Attachment to host cell membrane (by means of spikes) c. Envelope 1). Membrane around capsid - enveloped virus (a). Not all viruses have envelope (b). If lack envelope - naked virus 2). Composed of: (a). Bilayer of phospholipids and proteins (b). Derived from host bell membrane during viral multiplication
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3). Functions : (a). Protection from drying (enhances transmission)
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Unformatted text preview: (b). Makes virus more susceptible to chemical agents that dissolve lipids (c). Attachment to host cell membrane (by means of spikes) VIRAL SHAPE : A. Structure of capsid: 1. Subunits – called capsomeres 2. Composed of short chains of amino acids 3. All capsomeres in capsid identical a. Same types amino acids b. Same # amino acids c. Same arrangement amino acids 4. Even # capsomeres in capsid 5. Capsomeres symmetrically arranged around the core to give the virus it’s shape B. Shapes (see figures in handout) 1. Polyhedral (icosahedral - most common) 2. Helical 3. Complex (binal) (With the exception of the pox viruses all animal viruses are icosahedral or helical)...
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viruses - (b Makes virus more susceptible to chemical...

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