Download Bacteria - St. Paul`s Orange

 Today in Science:
Science
December 13, 2010
Chapter 4 Section 2
“Bacteria”
 You will need:



Science book
Spiral notebook
Pencil
 Order of events:
1. Open books to pg 126
(Intro.)
2. 4.2 Notes
3. Draw/Label
4. Bacteria Song
The Bacterial Cell: Facts
 Discovered in the late 1600s (Anton Van Leeuwenhoek)
 Single-celled organism
 Prokaryotes (genetic material in their cells is NOT in a
nucleus)
 Accomplish all tasks necessary for life
 Use energy
 Grow and develop
 Respond to its surroundings
 Reproduce
More Cool Bacteria Facts
 600 types of bacteria live on the skin
 Saliva contains about 6 different kinds
of bacteria
 One cell can double within 20 to 30
minutes
Cell Shapes
1. Spherical
2. Rodlike
3. Spiral Shaped
Cell Structures
 Cell Wall
 Cell membrane
 Cytoplasm
 Ribosomes
 Genetic material (located in the cytoplasm)
 Flagellum (whiplike structure; propeller)
Note: Not all Bacteria have a flagellum
TIME TO DRAW 
 Turn to page 128 in your science book
 Copy figure 7 into your science notes
 Label the figure after you draw it.
Two Kingdoms of Bacteria
1. Archaebacteria
“Ancient Bacteria”
 Live in EXTREME environments


Hot springs, lemon juice, salty waters, intestines of
animals, mud, sewage
Produce foul odors

1. Eubacteria
Live everywhere (on you!)
 Help maintain Earth’s physical conditions


Produce food and oxygen
 O Bacteria !
(to the tune of “Oh Susanna”)  You reproduce by fission
 You do not have a
nucleus
You do have a cell wall
You live in water, air
and soil
or anywhere at all
http://www.teachertube.com/view_video
.php?viewkey=1d2b0339687bdd7fcfb0&p
age=1&viewtype=&category=
and you do so very fast
And under harsh
conditions
in an endospore you last
Oh, Bacteria
so simple and so small
without you ecosystems
would not function well
at all
Reproduction
 Bacteria need:
 Plenty of food
 The right temperature
 Suitable conditions
Note: Reproduction conditions are
rarely ideal
Key terms:
 Use your book to find the following terms
 Write the word and definition in your notes.
 Binary Fission
 Asexual Reproduction
 Sexual Reproduction
 Conjugation
Key terms:
Binary Fission: process in which one
cell divides to form two identical
cells.
Asexual Reproduction: a
reproductive process that involves
only one parent and produces
offspring that are identical to the
parent.
Binary Fission
Reproduction
Key terms:
 Sexual Reproduction: involves two
parents who combine their genetic
material to produce a new organism.
 (New cell differs from both parents)
 Conjugation: The process in which a
unicellular organism transfers some of
its genetic material to another
unicellular organism.
Reproduction
Name of
Process
Number of
Parents
What Occurs in
Process
Result of
Process
Asexual
Reproduction
Binary Fission
Sexual
Reproduction
Conjugation
One
Two
•Cell duplicates its
genetic material
•Cell divides into 2
separate cells
•One bacterium transfers
some of its genetic
material into another
•New cells identical to
parents
•Bacteria that are
genetically different from
parents
http://www.teachertube.com/view
_video.php?viewkey=1d2b0339687
bdd7fcfb0&page=1&viewtype=&cat
egory=
 http://www.africangreyparrot
t.com/sciencekaraoke1.html