BIO SCI 94 Lecture 11: Lecture 11

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Nancy Burley

Document Summary

Mycorrhizae - associations between fungi and living roots of most (>90%) vascular plants; Hyphae surround plant cells - (n, some p) -- basidiomycota. Endomycorrhizal (arbuscular --amf) - hyphae penetrate plant cells - (mostly p) -- glomeromycota. Antibiotics, drugs, steroids, pencillium - the pill penecillin. In plants, cell walls contain cellulose, to increase strength/rigidity, while fungi, chitin serves a similar function/ this evidence is indicating fungi are more similar to animals than plants. Traditional phylogeny - reproductive structures; molecular studies are mixed support. Key lineages: know human uses and ecological impacts. Diploid phase - dominants life cycle; no alteration of generations. Ancestor - colonial protists similar to extant choanoflagellates. The clade opisthokonta - synthesize chitin, glycogen is storage molecule, posterior flagella. Molecular clock - hypothesis that amino acid base substitutions accumulate as a linear function of time. Codon: 3 nucleotide bases in sequence that code for aa. *non-synonymous substitution: change in dna causes aa change.