BIO 201 Lecture Notes - Lecture 6: Abiogenesis, Nucleoid, Crystal Violet
6 Sep 2018
School
Department
Course
Professor
Bio 201
Lara Hutson
Lecture 6: Originals of life; prokaryotes: Evolution of eukaryotes (Ch. 5, pp. 81-84, 101-102)
Overview
- Origins of life – protocells
- Modern cells
o Domains of life
o Bacteria
Earth ~3.8 BYA
- NH4, CH3, H2, H2S, probably also CO2, H2O, and some others
- No free O2
- Intense solar radiation and other high-energy inputs
The Miller-Urey Experiment (1953)
- Mimicking conditions on earth 3.8 BYA
- Input NH4, CH3, N2, H2O, ran electricity for a week and created amino acids.
- Updated experiments in subsequent years based on refined models of Earth’s atmosphere 3.8
BYA and creates Nucleotide bases, sugars, and lipids.
Minimal requirements for protocells:
- Abiogenesis: must be made from molecules that could arise in the absence of pre-existing life.
- Catalysis: the chemical reactions on which life depend must be fast enough to counteract forces
of entropy
- Complexity: Hereditary material must be able to store information to build a cell.
- Self-replication: hereditary material must be able to copy itself
- Compartmentalization: contests must be concentrated and protected from the environment.
Protocells are not living organisms because they cannot transduce energy from outside and use it to
fuel cellular processes.
Document Summary
Lecture 6: originals of life; prokaryotes: evolution of eukaryotes (ch. Modern cells: domains of life, bacteria. Nh4, ch3, h2, h2s, probably also co2, h2o, and some others. Input nh4, ch3, n2, h2o, ran electricity for a week and created amino acids. Updated experiments in subsequent years based on refined models of earth"s at(cid:373)osphere (cid:1007). 8. Bya and creates nucleotide bases, sugars, and lipids. Abiogenesis: must be made from molecules that could arise in the absence of pre-existing life. Catalysis: the chemical reactions on which life depend must be fast enough to counteract forces of entropy. Complexity: hereditary material must be able to store information to build a cell. Self-replication: hereditary material must be able to copy itself. Compartmentalization: contests must be concentrated and protected from the environment. Protocells are not living organisms because they cannot transduce energy from outside and use it to fuel cellular processes. that stores information. Dna vs. rna some viruses contain protein compartment.
