BILD 3 Lecture Notes - Lecture 4: Staphylococcus, Gut Flora, Heterotroph
1 Nov 2016
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Document Summary
Nothing more than genetic information enclosed in a protein code. May or may not have an extra enzyme, but definitely does not have complexity in the most basic of prokaryotic cells to satisfy the key attributes of life argue that viruses are not alive, because they depend on their. May have originated from plasmids or transposable elements. Enter a host cell and use the host"s biosynthetic machinery to reproduce and synthesize its proteins (only goal) Can be either dna or rna; can be either single stranded or double stranded. Wide variety of shapes, and can be identified by shape alone. Two categories: nonenveloped ( naked ) viruses: genetic material enclosed only by a protein shell called a capsid, enveloped viruses: genetic material enclosed by a capsid and one or more membrane- like envelopes. Hiv can escape host cells and affect new ones. At some point, transposable elements gained genes that enabled them to leave host cells and infect others.
