Lecture #04

Lecture #04 - Lecture 4 Finish The Big Tree of Life...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Lecture 4 Lecture 4 Properties of Viruses Properties of Viruses BBOM 11e Sec. 2.1-2.2 Sec. 9.1-9.3, 9.5-9.7 Definition and General Properties of Microorganisms Definition and General Properties of Microorganisms Finish The Big Tree of Life Finish The Big Tree of Life SSU rRNA A good molecular chronometer SSU rRNA A good molecular chronometer 1. 2. 3. 4. Universal Distribution – All cells have ribosomes; therefore, all have SSU rRNA. Functional Constancy —Participates in protein synthesis in all cells Alignability —Homologous regions with universally conserved sequences Appropriate rate of change for Large and small E d - Many constant and variable regions A “Goldilocks” Chronometer Molecule Just the right length, not too long, not too short! 5.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Small Subunit (SSU) rRNA Small Subunit (SSU) rRNA 16S rRNA of E.coli SSU rRNA Reference Molecule (for Molecular Phylogeny) 30S Small Subunit 16S rRNA ~1540 Nucleotides Escherichia coli 70S Ribosome Start Finish Measuring Evolutionary Distances with SSU rRNA Sequences Measuring Evolutionary Distances with SSU rRNA Sequences Count number of differences at each base position 3/12 Use distance computer algorithm to generate a phylogenetic tree showing best fit of corrected E d. Compute corrected E
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/13/2008 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell.

Page1 / 8

Lecture #04 - Lecture 4 Finish The Big Tree of Life...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online