Biology Outline Essay
SECTIONS 002 and 005
DR. STEVEN POMARICO
AN INTRODUCTION TO LIFE ON EARTH
What is Biology?
--- The science of living organisms and life processes.
O.K., so what is science?
If biology is the science of “life,” what exactly is life?
We all recognize what life is, but it’s difficult to define.
The characteristics of life: 1) -Complex, organized structure
2) -Response to stimuli - a change outside (or inside) leads to another change
3) -Homeostasis - the ability to maintain the structure and regulate the internal environment.
4) -Ability to acquire material and energy >The material and energy are often …show more content…
Reproduction Individuals reproduce their own kind.
The genetic information for “How to build an offspring” is stored in the DNA of the parent(s) and that information is passed on to the offspring.
Evolution If the environment changes, then the population of organisms must change to fit the environment or possibly die out. This process of survival of the fittest is natural selection
The evolutionary changes are usually slow, taking several generations and occur by the accumulation of DNA changes known as mutations.
>>>>>All life forms have these characteristics in common, yet there is an amazing diversity in the forms of life on the planet.
All living organisms are organized into groups. Each of the major organizational groups called domains
There are two prokaryotic domains; Bacteria and Archaea and a eukaryotic domain; Eukarya.
Within the domains are at least 6 groups known as kingdoms (See fig. 1-8).
Each of the major organizational groups called kingdoms have different attributes which define them. (See table 1-1)
The first difference is cell type Prokaryotic versus Eukaryotic