STUDY of LIFE (Biology 150 - University of Miami)
Course is divided into (3) parts:
click for next page
Modern Biology is often described as... the BIOCHEMISTRY of the CELL
1. CELL THEORY
3. BIOENERGETICS (energy transformation)
Tenets of the Cell theory - Universal Features of Cells on Earth
2. EVOLUTION..."Descent with modification"
"Nothing in biology makes sense except in the light of evolution"
Theodor Dobzhansky (1973) in Amer. Bio Teacher 35:125-129
Evolution is simply a change in natural/physical characteristics of a population over time
In 1858 Charles Darwin & Alfred Russell Wallace present papers to Linnaean Society
with 2 important new hypotheses about biological PATTERNS in the natural world.
... all species (past & present) are related by descent from common ancestor
... hypothesized all species come from preexisting species & they change through time
- individuals in a population vary in hereditable traits...(look around class)
- this accounts for the diversity we see in biology...
- living things change gradually over time to become new forms...
Darwin proposed a PROCESS (mechanism) for this (PATTERN) descent & change...
Artificial Selection.... examples
in Cabbage Plants*...
broccoli, cauliflower, Brussels sprouts, cabbage, kale, and
collard greens are all derived from Wild Mustard plants
horticulturalists SELECT* wild mustards with large buds = Brussels sprouts
Natural Selection.... examples
case study 1* - Peter & Rosemary Grant & medium ground finch
case study2 - feeding preferences of different predators does cause changes in guppy
populations favoring long-term evolutionary changes by natural selection
David Reznick (UCR) & John Endler (UCSB) - Trinidadian guppies
experimental design and results*
Student Media - Process of Science: Selection or How environment affects populations*
UNITY... Comes from fact that all living things
evolved by same rules, the Laws of Evolution Evolution of Humankind
3. BIOENERGETICS - (science of EQUILIBRIUM THERMODYNAMICS)...
science of energy flow and transformation
within, through, and between organisms...
"cells do not produce energy - they consume energy"
Unity...chemical reactions of life are the same in bacteria, plants, animals
|the CELL is FUNCTIONAL UNIT of LIFE & of all known LIVING SYSTEMS|
|CELL THEORY is to BIOLOGY as ATOMIC THEORY is to PHYSICS|
| Definitions of a Cell :
A particular organization of
matter, bounded by a selectively
permeable membrane, that is
capable of self-reproduction,
without the presence of other
living organism. (eliminates viruses).
|"Living organisms are composed of
inanimate molecules... and nothing is
alive in a cell except the whole of it?" Matrin Olomucki (1993)
The chemistry of life. NY, McGraw Hill