1. Living Systems Bacteria and Protists Dr. Marjorie Anne Wallace,
Elementary Science Resource Teacher

2. All living things are made up of cells.
Bacteria cells
Plant cells
Animal cells
Fungi cells and
Protozoan cells

3. 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.

4. Bacteria cells Kingdom Bacteria
Bacteria are the smallest and simplest organisms in the world
Bacteria can be found everywhere life is.
Kingdom Bacteria

5. Bacteria cells cheese Bacteria can be helpful 1. Feed on dead matter-
=decomposers;
2.Make certain foods-
cheese, pickles, yogurt,
butter, chocolates;
3. In our intestines bacteria
make vitamins
and help digest foods.
yogurt
Pickled eggs

6. A drawing of a bacteria cell.
cytoplasm
cell wall &
cell membrane
*nuclear material

7. Question #1: 1 It is easy to identify a bacteria cell under
the microscope because it doesn’t have-
A cell membrane
B cell wall
C cytoplasm
D nuclear membrane

8. Answer to question #1.
You got it! D
Bacteria do not have a true nucleus so they don’t have a nuclear membrane.

9. 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?

10. Kingdom Protista Amoeba 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.
nucleus
Cell
membrane
cytoplasm

11. Kingdom Protists Some Protozoan cells have several nuclei.
Large Nucleus &
nucleolus
Some Protozoan cells have several nuclei.
The Nucleus is the control center of the cell. This organelle tells the cell what to do.
These microorganisms live in moist environments.
micronucleus
Paramecium

12. 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.

13. The World of Protists
Plant-like protists can produce their own food by using the Sun’s energy.
Plant-like protists have chlorophyll,
a green pigment.
Euglena are animal-like & plant-like.
Euglena
eyespot
nucleus
chloroplast

14. Question #2
Inside of a cell, many materials and organelles are suspended and protected by this gelatin like substance-
F cell wall
G cell membrane
H cytoplasm
J chloroplasts

15. Answer #2
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.