MICR 2123 Study Guide - Midterm Guide: Periplasm, Prokaryote, Aphotic Zone
Document Summary
Planet earth is ~ 4. 5 billion years old. Microbial life arose (prokaryotic) ~3. 4 to 3. 8 billion years ago. Oxygen appeared in atmosphere ~1. 5 billion years ago. Eukarya arose ~ 1. 1 billion years ago. The most widely used way to construct is to align is the gene encoding the small subunit rrna (ssu rrna) Estimates the relative divergence between organisms based upon 16s rrna gene sequence alignments. Uses an algothythm to determine the relative divergence. The majority of the tree is microbial small portion is visible to the eye. Molecular phylogeny/ genetic relatedness: generates a series of branching groups of related organisms called clades (a group of species that share a common ancestor) Phylogeny: natural history of an organism or taxonomic group. Taxonomy: the science of description, naming, and classification of organisms. Taxonomy: is the description of the distinct life-forms and their organization into different categories with shared traits: includes. Classification: recognition of different classes of life.
