BI110 Chapter Notes - Chapter 3: Anoxygenic Photosynthesis, Cyanobacteria, Anaerobic Respiration

10 views8 pages
Published on 17 Apr 2013
School
WLU
Department
Biology
Course
BI110
Professor
Page:
of 8
The Seven Characteristics of Life
A. Display order: all forms of life including
this flower are arranged in a highly ordered
manner, with the cell being the fundamental
unit of life.
B. Harness and utilize energy: like this
hummingbird, all forms of life acquire energy
from the environment and use it to maintain
their highly ordered state.
C. Reproduce: all organisms have the ability
to make more of their own kind. Here, some
of the bacteria have just divided into two
daughter cells.
D. Respond to stimuli: organisms can make
adjustments to their structure, function, and
behavior in response to changes in the
external environment. A plant can adjust the
size of the pore on the surface of its leaves to
regulate gas exchange.
E. Exhibit
homeostasis:
organisms are able to
regulate their internal environment such
that conditions remain relatively constant.
Sweating is one way which the body
attempts to remove heat and thereby
maintain a constant temperature.
F. Growth and development: all organisms
increase their size by increasing the size and /
number of cells. Many organisms also change
over time.
G. Evolve: populations of organisms change
over the course of generations to become
better adapted to the environment. The
snowy owl illustrates this perfectly.
Timeline for the evolution of major forms
of life:

Document Summary

Here, some of the bacteria have just divided into two daughter cells: respond to stimuli: organisms can make adjustments to their structure, function, and behavior in response to changes in the external environment. A plant can adjust the size of the pore on the surface of its leaves to regulate gas exchange. regulate their internal that conditions remain. Many organisms also change over time: evolve: populations of organisms change over the course of generations to become better adapted to the environment. Timeline for the evolution of major forms of life: *when earth first formed it was too hot it took 500 million years for earth to cool down for life to exist. Oparin-haldane hypothesis: organic molecules that formed building blocks of life could have been formed given conditions that prevailed on primitive earth, reducing atmosphere that lacked oxygen. Hydrogen, methane, and ammonia: allows for synthesis of complex organic molecules.