Lecture 2 - 2 Origins of life Iain McKinnell Dept Biology...

Info iconThis preview shows pages 1–19. Sign up to view the full content.

View Full Document Right Arrow Icon
2. Origins of life Iain McKinnell Dept Biology
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Context of today's class Talk about life Importance of light Fundamental units of life How life came to be…
Background image of page 2
History of the Earth condensed
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
What is life? Order Energy Reproduction Stimuli Homeostasis Evolution
Background image of page 4
How do we classify it? 5 kingdoms Protista Fungi Plantae Animalia Monera
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
How do we classify it? Bacteria Archea Eukarya
Background image of page 6
How did we get here?
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Importance of light
Background image of page 8
Light and matter
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Light and energy
Background image of page 10
Light and life
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Life depends on light Order Energy Reproduction Stimuli Homeostasis Evolution
Background image of page 12
Fundamental unit of life is the cell.
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Back on primordial Earth Extremely harsh conditions water vapour carbon dioxide carbon monoxide hydrogen nitrogen ammonia methane. Note: no oxygen (O2) was present in early Earth's atmosphere. Reducing atmosphere
Background image of page 14
Chemistry of life: Atoms smallest units of matter that can undergo chemical change made up of three basic subatomic particles protons positively charged neutrons neutrally charged electrons negatively charged particles Valence electrons electrons in the outer shell Participate in chemical reactions Read your Purple Pages
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chemical Reactions Atoms are most stable when the outermost orbital is full Most elements do not have full sets of valence electrons Atoms may give, take, or share electrons in order to achieve full outer orbital Chemical reaction An event where groups of atoms redistribute electrons among them
Background image of page 16
Oparin-Haldane hypothesis (1920’s) Organic molecules that formed building blocks of life could have been formed given conditions that prevailed on primitive Earth
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chemical origins of life The Miller-Urey Experiment abiotic synthesis of biologically important molecules is possible Organic Molecules
Background image of page 18
Image of page 19
This is the end of the preview. Sign up to access the rest of the document.