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Biology 2
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are able to obtain energy from a source that is from the physical environment, by using
light or chemical energy
.
Heterotrophs
to obtain their energy from other living organisms or other remains.
Example of autotrophs
plant cells, some protist cells
2 features a
prokaryote
cell does not have that an
eukaryote
does
1. no nucleus
2. no membrane bound organelles
3 feature that set
fungi
cells apart from
plant
cells
1. no chloroplast
2. heterographs
3. rigid cell walls made from
chitin
Suggest why the
protistans
have traditionally been a
difficult
group to
classify
?
there are
many diferent
type of protists
3 features
that all cells have in common
1. cytoplasm
2. Genetic material
3. Cell membrane
Name of the virius when they are
outside a host cell
VIRION
Why
are viruses
not
considered
living
when outside a host cell?
cause they are
inactive
and cannot
reproduce
Why do some scientists hypothesize that archaea are the first living things on Earth?
because they
thrive in extreme conditions
that mimic the Earth's atmosphere.
Example of extreme conditions
.
boiling/ acidic water
hydrothermal vents
super-salty pools
Antartic permanent ice
Types of Archaea
Thermoacidophiles
Halophiles
Methanogens
Thermoacidophiles
- Extreme temperatures & acidity
- volcanoes and hot springs
- Obtains energy from
sulfur
Halophiles
- high salt enviornment
- obtains energy from
salt
Methanogens
-
oxygen free
- by converting
inorganic molecules
leaving methane gas as a waste product
Nitrogen Cycle
bacteria converts ammona to usuable compounds
ammonia => Nitrite => Nitrate
Bacterial Classification
1. shape
2. cell wall
3. Energy Source
Bacteria Shape Types
1.
cocci
: round
2.
Bacilli
: rod- shaped
3.
spirilli
: spiral shaped
Cell Wall Bacteria Types
1. Gram - positive
- purple - thick
2. Gram - Negative
- Pink - Thin
Bacteria Groupings
diplo
: arranged in pairs
staphylo
:
arranged in clusters
strepto:
arranged in chains
Grain Stain
A dye that hgihlights basic
differences
in the arrangement of molecules in
bacterial cell walls
.
Author
just15abi
ID
65667
Card Set
Biology 2
Description
Types of Living things
Updated
2011-02-11T10:09:41Z
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