Objective 3

The student will demonstrate an

understanding of the interdependence of organisms and the

environment.

J. Carson

D. McElreath

John Marshall High School

Interdependence

Bacteria and other organisms rely on their environmentand other species for survival.

Bacteria

Organisms that are made of prokaryotic

cells

Prokaryotic Cells•Have no nucleus

•Do not have membrane bound organelles

•Are very small

•Often have a flagellum for movement

What kingdom?

Bacteria are placed into one of these kingdoms:

• Archaebacteria-”ancient bacteria”

• Eubacteria-”true bacteria”

Shapes of bacteria

Bacteria are classified according to their shape:

• Round is called cocci

• Rod shaped is called bacilla• Spiral shaped is called spirills

Where do they live?

•Bacteria are found in all environments

Respiration

•AEROBE – bacteria that live in the presence of oxygen

•ANAEROBE – bacteria that live in the absence of oxygen

Role of bacteria

•Some bacteria are helpful

•Some bacteria are harmful

Helpful bacteria• Decomposers break down dead organic

material

• Biotechnology - inserting helpful genes into a plasmid

• Bioremediation - bacteria eat up oil spills

• Food production – cheese and yogurt

• Put nitrogen back into the soil

• Aid in digestion

Harmful bacteria• Bacteria that cause diseases are

called pathogens.

• Some diseases caused by bacteria are:* tuberculosis * anthrax* tetanus * lyme disease

• Antibiotics are drugs thatkill bacteria.

http://www.virology.net/Big_Virology/BVFamilyIndex.html

Biology, Kenneth R. Miller & Joseph Levine, 1991, Prentice-Hall, Inc., Englewood Cliffs NJ.

Biology: The Web of Life, Eric Strauss & Marylin Lisowski, 1998, Scott Foresman Addison Wesley, Menlo Park CA

TAKS Power Tools, Glencoe Science, Glencoe McGraw-Hill, 2001, New York, NY.

Microsoft Office Clipart

Sources