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15 Cards in this Set

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Protobionts
Early, Chemical-concentrating, Bubblelike structures named by Oparin
bubbles
Anaerobically
Any Process that can occure without oxygen
AN-aerobic
endosymbiosis
theory that proposes that eukaryotic cells evolved from a symbiosis between different species of prokaryotes
theory
sexual reproduction
the process of producing offspring through an alternation of fertilization (producing diploid cells) and meiotic reduction in chromosome number (producing haploid cells)
multicellularity
fosters specialization
metabolism
the sum of all chemical processes occurring within a living cell or organism
primary abiogenesis
Oparin proposed that life must have arisen from nonliving matter under a set of very different environmental circumstances some time in the distant history of the earth.
nucleus
-in atoms
-in eukaryotic cells
in atoms-the central core, containing protons and neutrons
in eukaryotic cells- the membranous organelle that houses the chromosomal DNA.
prokaryotes
bacteria and archaebacteria;
cells lacking a membrane-bounded nucleus or membrane-bounded organelles.

SIMPLE BODY PLAN, NO NUCLEUS

appeared 2.5 billion years ago
eukaryotes
cells characterized by membrane-bounded organelles, most notably, the nucleus, and one that possesses chromosomes whose DNA is associated with proteins; organisms composed of such cells.

MORE COMPLEX BODY PLAN
coacervates
spherical aggregations of lipid molecules in water, held together by hydrophobic forces
Bubble
extreme halophiles
salt lovers (archaebacteria)
bacteria
major group of prokaryotes; have very strong cell walls and a simpler gene architecture
peptidoglycan
a key compound (protein cross-linked carbohydrate material) in the cell walls of most modern prokaryotes
methanogens
among the first studied archaebacteria; produce methane

among most primitive archaebacteria existing today