CELLS: AN OVERVIEW

Biology – Unit 1B

CELL THEORY

CELL THEORY

Main Point #1:

Cells are the basic unit of life.

As in- Cells are the building blocks

CELL THEORY

Main Point #2:

All living things are

made of cells.

Unicellular organism - ONE celled organism

Multicellular organism- MULTIPLE celled organism

CELL THEORY

Main Point #3:

All cells are made by other living cells.

As in- cells come from cells (mitosis and meiosis)

WHY DOES THAT MATTER?

• How life works

• How disease works

• Cancer

• Depression

• How to treat diseases

PROKARYOTES VS. EUKARYOTES

TWO MAJOR CATEGORIES

OF CELLS

THERE ARE TWO GROUPS OF PROKARYOTIC CELLS: BACTERIA AND

ARCHAEA

This Photo by Unknown Author is licensed under CC BY

PROKARYOTES

PRO rhymes with NO

They’re cells with NO

membrane-bound

organelles.

Prokaryotes also have NO

true nucleus.

MOST PROKARYOTES ARE SINGLE-CELLED ORGANISMS

EUKARYOTES

EU rhymes with DO

They’re cells that DO have membrane-

bound organelles.

EUKARYOTES MAKE UP PLANT, ANIMAL, AND FUNGI

CELLS…

…LIKE THE CELLS OF THIS TREE

ALL CELLS CONTAIN

CYTOPLASM

Cytoplasm is the

jelly-like filling that

both prokaryotes and

eukaryotes have.

ALL CELLS CONTAIN

DNA.

All cells have DNA which is necessary

for all cells to function and

replicate.

THE END