BIO 1002 Chapter 19 Microbes

BIO 1002 Chapter 19 Microbes - Chapter 19 The Hidden World...

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

View Full Document Right Arrow Icon
Chapter 19: The Hidden World of Microbes A. Anthrax is a microbe. Microbes : things that are too small to be seen by the naked eye; you naturally: A. Prokaryotes range in size 0.2-1.0 μ m micrometers all bacteria Denococcus radiodurans : “Super Bacterium” o survive 3000x more radiation than humans o tolerate extreme dehydration, heat, and cold o used to “chew up” toxic waste o Exxon-Valdez oil spill Part of the Bacteria and Archaea Domains 8000 species described, may be 100-1000x that number 1 st organism to appear on Earth, 3.5 billion years ago. 1. Structure : a. Cell wall = semi-ridged, permeable, made of peptidoglycan (carbohydrate with amino acids attached). Gives bacteria shapes. 1) bacilli (spheres), cocci (rods), spirilla (corkscrews) b. Capsules and Slime Layers attach bacteria to surfaces 1) capsule = highly organized, firmly attached to cell wall 2) slime layer = less organized, loosely attached to cell wall c. Pili = hair-like structures on the surface of bacteria which aid in attachment d. Flagella = rotates and aids in movement e. Endospore = protective ‘resting’ structures, bacteria surrounded by durable cell wall. Resistant to extreme conditions 2. Reproduction :
Background image of page 1

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

View Full DocumentRight Arrow Icon
a. Asexual in the form of binary fission b. Sexual in the form of conjugation using plasmids 3. Energy Sources : a. Autotrophs using photosynthesis or chemosynthesis b. Heterotrophs including symbiotes 4. : a. Gonorrhea, syphilis, Tuberculosis, Lyme disease B. Unicellular eukaryotes range in size 10-100 μ m How big is a μ m or micrometer (micron)? A meter is about a yard, then you divide it into 1,000,000- that is a
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 10/16/2008 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

Page1 / 5

BIO 1002 Chapter 19 Microbes - Chapter 19 The Hidden World...

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