BIOL 202 Lecture 3: Chapter 3: Concepts and Tools for Studying Microorganisms

57 views6 pages
7 Feb 2017
School
Course

For unlimited access to Class Notes, a Class+ subscription is required.

Chapter 3: Concepts and Tools for Studying
Microorganisms
Microscopy & Genetics
Oil immersion: the oil refracts light into the objective lens.
o Every time light hits a different substance, it refracts differently;
the oil has a similar diffraction as glass slide.
o Make sure that the objective is touching the oil; there should be
no air between the slide and the objective.
Phylogenetic Tree
Ribosomal rRNA was sequenced.
o Carl Woese sequenced ribosomes because every organism has
this (it produces proteins).
In this class, we will deal with:
o DomainKingdomPhylumClassOrderFamilyGenus
Species
Classification of organisms requires the sequencing of 16S ribosomal
rRNA.
Scientific Names: Binomial System
Family name and Genus
o First letter capitalized and name written in italics.
Genus: specific epithet.
Species name: small letters and written in italics.
Must include the first letter of genus.
Three Domain System: Bacteria
Prokaryotes; lac cell structure or nucleus (compact one cell).
Cell wall is made up of peptidoglycan (NAG and NAM connected
together).
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 6 pages and 3 million more documents.

Already have an account? Log in
2
Contain 70s ribosomes.
o Humans also have 70s ribosomes in mitochondria.
Bacillus refers rod-shaped.
o Bacillus is also used to refer to the genus of a specific bacteria.
Three Domain System: Archaea
Prokaryotes.
Lacks nucleus, peptidoglycan cell wall.
Unique lipids in membranes: ether linkage.
Found in extreme environments; pH, temperature, salt concentration.
Three Domain System: Eukarya
Eukaryotes
Have nucleus and membrane bound organelles.
Larger than prokaryotes and are more complex.
Bacteria Are Not Simple
Exhibit complex cellular processes.
o Since DNA is their hereditary material, they can be used to
model what may happen to humans.
Bacteria adapt quickly
o Capable of adapting from aerobic to anaerobic environments.
Reproduce quickly.
o Can be used to create a substance.
Bacteria Can Cooperate
Bacteria work in biofilms: complex, metabolically cooperative
communities which work together to thrive on the surrounding
environment.
o The bacteria in the biofilm secrete polysaccharides.
o Bacteria in biofilm can leave the biofilm, spread out, and then
form another biofilm.
Bacteria Can Communicate
Quorum sensing: bacteria sense their density.
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 6 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class