3-kingdom-tour-2[1]

3-kingdom-tour-2[1] - If I were to find an oxygenic...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: If I were to find an oxygenic phototrohpic bacteria lying on the street corner, what type of bacteria would it likely be? 1. Deinococci 2. Cyanobacteria 3. Spirochete 4. Green sulfur bacteria Welcome back! • We’ll continue our kingdom tour – Archaea and protists today – Next unit will be habitat diversity (probably not until next week) • First knowledge check is due Wednesday – There will be one due every Wednesday at noon from now on • Be sure to look for the extra credit in lab! – To be announced Wed or Thu, likely Questions? • From last lecture? • From the discussion questions? • From lab? Kingdom tour outline 1. Bacteria • Phyla • Peptidoglycan 2. Archaea • Extremophiles • Phyla • Membranes 3. Protists • Selected phyla 4. Plants • Brief overview (see lab) 5. Fungi • Phyla 6. Animals • Selected phyla ven more detailed bacterial phylogeny • Based on 16S rRNA How did we figure all this out? (aka methods of identifying bacteria) Enrichment culturing – Take bacteria from the environment and expose them to specific growth conditions in the lab – Allows you to select for bacteria with specific requirements – Once you grow it in the lab, you can morphologically identify it But it’s estimated that <1% of bacteria have been cultured Direct sequencing is a new technique – “Shotgun” PCRing of environmental samples, • aka “community sampling” – Take a sample, lyse the cells, and sequence the DNA – Compare the sequences to known organisms – Many new bacteria have been discovered using this technique. • We know they’re there, but we’ve never observed them. If a bacteria has a lot of peptidoglycan in its cell wall, what lineage is it likely from? . Gram negative . Proteobacteria . Cyanobacteria . Gram positive . Euryarchaeota Peptidoglycan & bacterial cell walls • Bacterial cell walls get their rigidity from peptidoglycan (murein) – Composed of sugar derivatives and amino acids – Forms a cross-linked structure Gram-negative Peptidoglycan • Shape and rigidity determined by cross-linking • >100 variants in terms of amount and type of cross- linking • No, you don’t need to memorize this structure … Archaea • Currently refers to both a kingdom and a domain • Basic information – Prokaryotes – All single cellular – They have no peptidoglycan in their cell wall • Separates them from Bacteria • Notable characteristics – Many are extremophiles • But NOT all – Membrane structure Archaea phyla / groups Crenarchaeota Euryarchaeota Korarchaeota Extremophiles • Organisms that can live in extreme habitats • All the record holders are prokaryotes hat is the highest temperature an organism has been found to be able to survive and reproduce in?...
View Full Document

This note was uploaded on 11/11/2011 for the course ECON 100 taught by Professor Chandle during the Spring '11 term at UC Irvine.

Page1 / 54

3-kingdom-tour-2[1] - If I were to find an oxygenic...

This preview shows document pages 1 - 14. Sign up to view the full document.

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