Class Notes (890,991)
US (345,429)
UNL (1,764)
LIFE (82)
LIFE 121 (20)
Glider (11)
Lecture 6

LIFE 121 Lecture 6: Prokaryotes (Day 6)

4 Pages

Life Sciences
Course Code
LIFE 121

This preview shows page 1. Sign up to view the full 4 pages of the document.

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
070615 PROKARYOTES I. Prokaryotic Cells: pro = before karyon = kernel A. Prokaryotic cells lack membranebounded organelles such as nuclei, mitochondria, and chloroplasts etc. 1. DNA floats free in cytoplasm B. earliest fossils C. Prokaryotic organisms classified in 2 domains: 1. Domain: Bacteria = true bacteria and cyanobacteria 2. Domain: Arachaea = bacterialike organisms often living in extreme environments (e.g. acid hot springs, high saline) = extremophiles II. Archaea A. differ from the bacteria in cell wall and cell membrane B. Extremophiles 1. Extreme thermophiles: live in hot environments a. Sulfolobus live in sulfur rich volcanic springs up to 90C 2. Extreme halophiles halo=salt; phile= loving a. live in high saline environments 3. methanogens a. use CO2 to oxidize H2 ATP + CH4 (methane) as byproduct b. strict anaerobes c. some species live in anaerobic muds swamps and marshes marsh gas d. some species live in anaerobic guts herbivores (e.g. cattle, termites, humans etc. essential role in nutrition) C. Archaean phylogeny in state of flux as new species discovered III. True Bacteria A. Nutrition: see table 465 1. Photoautotrophs: light energy used to fix CO2 into organic compounds a. Contain bacterial chlorophylls very different structures from chlorophylls of cyanobacteria and plants b. No O2 is produced 2. chemoautotrophs a. energy from oxidation of inorganic compounds (e.g.) H2S, NH3, FE+2) +CO2 organic compounds 3. photoheterotrophs: use lights for Energy but must obtain Ci in organic forms (e.g. not as CO2) 4. chemoheterotrophs (heterotrophs) = consume organic compounds a. most species of true bacteria are heterotrophs B. Cellular respiration: production of ATP via the oxidation of chemical compounds 1. obligated aerobes: must have O2 for cellular respiration 2. facultative anaerobes: use O2 if present; can also use anaerobic respiration when low O2 concentrations 3. obligate anaerobes: killed by O2
More Less
Unlock Document
Subscribers Only

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
Subscribers Only
You're Reading a Preview

Unlock to view full version

Unlock Document
Subscribers Only

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.