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Transcript of Prokaryotes
Structure of Prokaryotes
Pro + karyote = before + nucleus
First single-celled organisms
Domains: Bacteria &
wide range of temperatures
Most abundant organisms
smaller than eukaryotes
& they are
first life forms
to appear on Earth.
Some are beneficial
(help w/ digestion in stomach & colon).
Some are harmful
(cause diseases, e.g., cholera, anthrax, etc.).
Shapes of Prokaryotes
Differences between Bacteria & Archaea
Bacteria & Archaea
No membrane-bound organelles
(e.g. nucleus, mitochondria).
DNA is in
Plasma membrane: selective barrier
allows passage of oxygen, nutrients, et
Encased by a
Some move using
Cocci are spherical prokaryotes
that occur alone & in pairs, chains, and clusters.
Bacilli are rod-shaped prokaryotes
that are usually solitary, but sometimes in chains.
Spirilla are spiral prokaryotes
that are corkscrew-shaped, but others can be comma-shaped or appear to be
Also among the
first living things
Membrane: branched HC chains attached to glycerol by ether linkages.
Able to survive extreme environments:
halophiles, acidophiles, & thermophiles
Wash your hands for better health
Cell membranes (phospholipids).
Ways of making food.
Bacteria and Archaea differ in their: