BIOL211#2 - Chapter 27 Prokaryotes Overview Most are...

Info iconThis preview shows pages 1–11. 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
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 27 Prokaryotes Overview Most are microscopic Extremely numerous The number in a single handful of fertile soil is greater than the number of people who have ever lived More bacteria in your mouth than the number of people who have ever lived Inhabit diverse habitats, including places too acidic, too salty, too cold, or too hot for most organisms Figure 27.1 Have a great genetic diversity Two strains of E. coli are genetically more different than a human and a platypus Classified into two Domains Bacteria Archaea Concept 27.1 Most prokaryotes are unicellular, although some species may form true colonies Most are small and have diameters in the range of 1 5 microns Prokaryotic cells have a variety of shapes Figure 27.2 The cell wall is an important feature Maintains shape Provides physical protection Prevents bursting in a hypotonic environment Bacterial cell walls contain peptidoglycan, archaea cells walls do not The Gram stain can be a useful tool Figure 27.3 The cell wall of many prokaryotes is covered by a sticky layer of protein or polysaccharide known as a capsule Figure 27.4 Some use fimbriae and pili to adhere to a substrate or to other individuals in a colony Figure 27.5...
View Full Document

Page1 / 40

BIOL211#2 - Chapter 27 Prokaryotes Overview Most are...

This preview shows document pages 1 - 11. Sign up to view the full document.

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