Class Notes (806,973)
Canada (492,546)
Biology (975)
BI110 (458)
Lecture 7

lecture 7.docx

4 Pages
Unlock Document

Wilfrid Laurier University
Matthew Smith

 Clicker question answers: o organic molecules essential to formation of life could have been made in the absence of life in the conditions on primordial Earth o Miller-Urey experiment showed that molecules crucial to life could be produced abiotically  Miller-Urey Experiment o ~50% of carbon put into experiment came to be part of organic molecules o Their experiment did not produce macromolecules; only the building blocks (purines, pyramidines, fatty acids, etc.)  Polymers from Monomers o Polymers were not formed in Miller-Urey Experiment o Polymerization reactions can occur on various surfaces (i.e. solid surfaces --> clay) o Putting amino acids or purines/pyramidines, etc. onto a solid surface such as clay can allow for the monomers to react (polymerization) in order to form polymers  Protobionts: The First Cells o Protobionts --> group of abiotically-produced organic molecules surrounded by membrane/membrane-like structure  Can form spontaneously  Phospholipids in a sol'n can spontaneously form a membrane  Phospholipids have hydrophilic heads and hydrophobic tails; hydrophobic tails associate and hydrophilic heads point away from each other thus in a sol'n, they spontaneously arrange into a membrane  Form spontaneously due to chemical processes  Primitive cell-like structure  Macromolecules captured in the middle of a membrane-bound vesicle  Essential to formation of life; gave a separate environment from aqueous environment  Compartmentalizes things  Some properties of life  May have been precursors of cells  The Central Dogma o DNA --> RNA --> Protein o o In order for central dogma to progress, various proteins are required to implement this process  Ribozymes o RNA molecules that catalyze specific reactions  Like enzymes (since they catalyze reactions), and are RNA (thus ribo for ribosome) o Discovered by Thomas Cech o DNA and proteins may have evolved after RNA o o Cech's hypothesis --> there may have been RNA molecules in early cells which served very basic functions and catalyzed very basic reactions o RNA may have served many functions --> storing info and catalyzing reactions  Testing the "RNA World" Hypothesis o David Bartel o Trie
More Less

Related notes for BI110

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.