Class Notes (836,216)
Canada (509,690)
Biology (6,817)
Biology 1001A (1,727)
Tom Haffie (1,170)
Lecture 3

Lecture 3 Outcomes.docx

2 Pages
108 Views
Unlock Document

Department
Biology
Course
Biology 1001A
Professor
Tom Haffie
Semester
Fall

Description
Lecture 3: Origin of Life Age of the Earth. - 4.6 billion years old Age of start of life on Earth. - 4 billion years – stromatolites – type of bacteria Domains of life. - Bacteria - Archaea - Eukaryotes Characteristics of LUCA - LUCA was not first form of life, just ancestor of every living thing on planet - Many branches 4 million years ago before LUCA - Perhaps things that came before died out early Characteristics shared by all domains of life. - 1. Cells made of lipids - 2. Genetic system based on DNA - 3. DNA to RNA to Protein transfer - 4. Common system of protein assembly - 5. ATP - 6. Glucose and Glycolysis Reason why the term “prokaryote” is inappropriate. - This is a bad term because it says that bacteria and archaea are evolutionary related and they are not - Also pro means before which means prokaryotes means” before nucleus” but there is no evidence to suggest LUCA didn't’t have nucleus Reductive evolution explanation for rise of bacteria and archaea. - LUCA proto-eukaryote? Had nucleus – fair amount of complexity - Complexity lost in bacteria and archaea – reductive evolution – advantage to get rid of things – streamlining Advantages of evolutionary simplification (streamlining). - Bacteria can then reproduce faster and evolve faster - This is why bacteria and archaea are found in extreme conditions – extremophiles Relationship between homochirality and life - All life: use L amino acids and D sugars - Essential to life because of specificity ; eg. For
More Less

Related notes for Biology 1001A

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit