Introduction:
Themes in the Study of Life
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Biology
Life
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Order
Evolutionary
adaptation
Response
to the
environment
Reproduction
Growth and
development
Energy
processing
Regulation
Fig. 1-3
New properties emerge at each level of
the biological hierarchy
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Atom
The smallest particle of an
element that retains the
properties of that element
carbon
nitrogen
oxygen
hydrogen
Subatomic
Particle
Particles that make up an atom
proton
neutron
electron
Molecule
A combination of atoms
DNA
glucose
water
Organelle
A structure within a cell that
performs a specific function
mitochondrion
nucleus
chloroplast
Cell
The smallest
unit of life
nerve cell
Tissue
A group of similar cells that
perform a specific function
nervous tissue
Organ
A structure usually
composed of several tissue
types that form a functional unit
the brain
Organ
System
Two or more organs working
together in the execution of
a specific bodily function
the nervous system
Biosphere
That part of Earth inhabited
by living organisms; includes
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- Spring '08
- Gray
- DNA, DNA double helix
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