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Prokaryotes

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by

Cherisse Bacani

on 18 April 2015

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Transcript of Prokaryotes

Bacteria &BaBacteriaBac
Structure of Prokaryotes
Prokaryotes
Prokaryotes
Pro + karyote = before + nucleus
First single-celled organisms
on Earth.
Domains: Bacteria &

Archaea
.
Can survive
wide range of temperatures
.
Most abundant organisms
on Earth.
Prokaryotes are
smaller than eukaryotes
& they are
less advanced
(fewer abilities).
Bacteria
Among the
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.).
Archaea
Shapes of Prokaryotes
1. Spherical

Differences between Bacteria & Archaea
Bacteria & Archaea
No membrane-bound organelles
(e.g. nucleus, mitochondria).
DNA is in
nucleoid
.
Interior:
cytoplasm
.
Plasma membrane: selective barrier
that
allows passage of oxygen, nutrients, et
c.
Encased by a
cell wall
.
Some move using
flagella
.
Cocci are spherical prokaryotes
that occur alone & in pairs, chains, and clusters.
2. Rod-shaped
Bacilli are rod-shaped prokaryotes
that are usually solitary, but sometimes in chains.
3. Spiral
Spirilla are spiral prokaryotes
that are corkscrew-shaped, but others can be comma-shaped or appear to be
loose coils.
2 types:
Cherisse Bacani
Bethany Kuo
Royson Lin
periods 4/5
Also among the
first living things
on Earth.
Membrane: branched HC chains attached to glycerol by ether linkages.
Able to survive extreme environments:
extremophiles
3 groups:
halophiles, acidophiles, & thermophiles
Archaea
Bacteria
Membrane has
lipid monolayer
&
branched HCs
.
Cell wall
lacks peptidoglycan
.
Autotrophs.
Several types
of RNA.
Membrane has
lipid bilayer
&
unbranched HCs
.
Cell wall
contains peptidoglycan
.
Heterotrophs.
Only
one type
of RNA.
Wash your hands for better health
Cell membranes (phospholipids).
Cell walls.
Ways of making food.
RNA types.
Bacteria and Archaea differ in their:
Full transcript