BIO 200 Lecture Notes - Lecture 11: Paraphyly, Symbiogenesis, Horizontal Gene Transfer
10 Oct 2016
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All life has a common ancestor, so all diversity is born of evolution. Can"t regulate transport of substances by membranes. Don"t perform metabolic functions (i. e. taking in nutrients, expelling wastes) Has a core containing nucleotides: viral hereditary material. Can be either dna or rna (never both) Nucleic acids can be circular or linear genetic material. The complete, infective form of a virus outside a host cell, with a core of rna or. Dna and a capsid: helical and icosahedral shapes. Icosahedron - shape with 20 equilateral triangular facets. Maximizes internal capacity of structure so it can hold more in less space: binal. Both icosahedral and helical elements: bacteriophage. Parasitizes a bacterium by infecting it and reproducing inside it: the basics of viral replication. Virus genome is a set of instruction that tricks the host cell into replicating it and therefore making copies of viral genome and producing viral capsid proteins.
