Biology 1001A Lecture Notes - Lecture 2: Reverse Transcriptase, Cell Membrane, Antibody
10 Feb 2017
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Read chapter sections 23. 1, 23. 3, and 23. 4 from the text, with special attention to pg. Lack a metabolic system to provide energy for their life cycle. Structure is minimal so that its genome can be transmitted from one host cell to another. Virus: one or more nucleic acid molecules surrounded by a protein coat or capsid. Capsid can be enclosed within a membrane or envelope. Viruses aren"t cells either as they don"t have cytoplasm surrounded by a plasma membrane. Dna can be dna/rna or double stranded or single stranded. Viruses can be a few genes to over a hundred genes. Atleast enough genes to encode their coat proteins. Some viral genomes code for virus-specific enzymes for nucleic acid replication. Helical viruses: protein subunits in a rodlike spiral around the genome. Polyhedral viruses: coat proteins form triangular units that fit together like the parts of the parts of a soccer ball.
