cel mol Flashcards
where did life originate
it came from the swamp - primordial ooze model
it came from outer space - arrived on a comet
what did the modern comets carry
carries organic molecules and amino acids
carried organic molecules to Earth
Murchison meteorite
use to detect organic molecules in interstellar molecular clouds
spectroscopy
We have evidence of intense early bombardment of Earth
both rocky and icy bodies
where did life originate
it came from the center of the earth - evolved in hydrothermal waters
At surface of Earth, the most primitive bacteria
are chemotrophs located at the Yellowstone hot spring bacteria
Similar bacteria have been found in very deep wells (10 km deep)
and at mid-ocean ridge black smokers
where did life originate
Development of more complex organisms
small, no nucleus, limited organelles, simple ring chromosome with few genes
prokaryote
large, organelles, nucleus, complex chromosomes with many
genes
eukaryote
resemble prokaryotes, some even have RNA
organelles
from symbiosis of prokaryotes
Evolution of eukaryotes
are the topic of intense study
cells
requires creative instruments and techniques
study of cells
is reductionist, based on the premise that studying the parts of the whole can explain the character of the whole
cell biology
