1. DO NOW…. What makes a living thing “living”???
What do ALL living things have in common???

2. Environmental Science Addendum to Chapter 4
Introduction to Cells
Environmental Science
Addendum to Chapter 4

3. Basic information
All living things (biotic factors) are made up of at least one cell.
Cells are classified as either eukaryotic (having a nucleus) or prokaryotic (having no nucleus).
Cells are very small.
Unicellular organism= made up of 1 cell
Multicellular organisms= made up of many cells

4. What is the difference between a eukaryotic cell and a prokaryotic cell?
Evolved 3.5 billion years ago
No nucleus
Cell membrane, cell wall, ribosomes, cytoplasm, flagella
Bacteria (Archae bacteria and Eubacteria)
Evolved 2.5 billion years ago
Have a true nucleus
Contains many organelles
Plants, animals, fungi, and protists
Eukaryotes
Prokaryotes

5. Common Features between prokaryotic and
eukaryotic cells include:
DNA Cytoplasm
Cell membrane Ribosomes

6. Cell Membrane 2 functions: Protects and supports cell
Regulates what enters/exits the cell-
Selectively permeable= only some things
can get in

7. Nucleus- “The Brain” Controls all of the cell’s activities
Contains and protects the DNA
Surrounded by the nuclear envelope regulates what enter/exits the nucleus

8. Cell Wall Supports and protects plant cells.
Contains cellulose (complex carb) that hardens the cell wall.
Has pores used to transport materials in/out
Cell Video