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Living Systems
Bacteria
and
Protists
All living things are made up of
cells.
• Bacteria cells
• Plant cells
• Animal cells
• Fungi cells and
• Protozoan cells
Bacteria Cells
• Single-celled
organisms
• No true nucleus
Bacteria cells have:
• Cytoplasm,
• a cell wall, and
• a cell membrane.
• Some bacteria are harmful
while others are helpful.
Bacteria cells
• Bacteria are the
smallest and simplest
organisms in the world
• Bacteria can be found
everywhere life is.
Bacteria cells
cheese
yogurt
Pickled eggs
• Bacteria can be helpful
• 1. Feed on dead matter=decomposers;
• 2.Make certain foodscheese, pickles, yogurt,
butter, chocolates;
3. In our intestines bacteria
make vitamins
and help digest foods.
A drawing of a bacteria cell.
Bacteria cell
cell wall &
cell membrane
cytoplasm
*nuclear material
Question #1:
• 1 It is easy to identify a bacteria cell under
the microscope because it doesn’t haveA
B
C
D
cell membrane
cell wall
cytoplasm
nuclear membrane
Answer to question #1.
• You got it! D
• Bacteria do not
have a true
nucleus so they
don’t have a
nuclear
membrane.
Protozoan cells
• These organisms are single celled
•
Some are consumers,
•
Some are producers,
• Some eat food AND need
sun light for photosynthesis.
• Can you name a few protozoa?
Kingdom Protista
Amoeba
nucleus
Cell
membrane
cytoplasm
• Single celled organisms.
• Cell membrane is on the
outside to protect the cell
and help matter move in
and out of the cell.
• Cytoplasm is the clear
jelly like matter that
protects the inside cell
parts.
Kingdom Protists
• Some Protozoan cells
have several nuclei.
• The Nucleus is the
control center of the cell.
This organelle tells the
cell what to do.
Large Nucleus &
nucleolus
micronucleus
These microorganisms live
in moist environments.
Paramecium
The World of Protists
• Protists live in lakes, rivers, oceans,
and damp soil.
• Most protists are single-celled and contain a
nucleus and other cell structures needed to carry
out their basic life functions.
• Some protists are multicellular and have more
than one cell.
• Animal-like protists are called protozoans.
• Amoebas, paramecium, and Euglena.
The World of Protists
• Plant-like protists can
produce their own food by
using the Sun’s energy.
Euglena
eyespot
• Plant-like protists have
chlorophyll,
a green pigment.
• Euglena are animal-like &
plant-like.
nucleus
chloroplast
Question #2
• Inside of a cell, many materials and
organelles are suspended and protected by
this gelatin like substanceF
G
H
J
cell wall
cell membrane
cytoplasm
chloroplasts
• You did it again! H
• Yes, cytoplasm is the
gelatin like or clear
jello like substance
that protects and
suspends all the
internal cell organelles.