The Cell Theory

CELL THEORY

A theory resulting from many scientists’ observations & conclusions

CELL THEORY 1. The basic unit of life is the cell. (Hooke)

In 1665, an English scientist named Robert Hooke made an improved microscope and viewed thin slices of cork viewing plant cell walls

Hooke named what he saw "cells"

CELL THEORY 2. All living things are made of 1 or more cells.

Matthias Schleiden (botanist studying plants)

Theodore Schwann (zoologist studying animals) stated that all living things were made of cells

Schleiden

Schwann

CELL THEORY 3. All cells divide & come from old cells. (Virchow)

Virchow

COMPARING CELLS

The size & shape of a cell relates to its function. (job it does)

What do all cells have in common?

COMMON CELL TRAITS

A cell is the smallest unit that is capable of performing life functions.

CELL MEMBRANE

Outer covering, protective layer around ALL cells

For cells with cell walls,the cell membrane is inside the cell wall

Allows food, oxygen, & water into the cell & waste products out of the cell.

CYTOPLASM

gelatin-like inside cell membrane constantly flows aka protoplasm

ORGANELLES

Many different types!

DNA

All cells have DNA (Deoxyribonucleic Acid) It’s the cells genetic material.

– In other words it is what makes up the cell, and gives it the ability to reproduce.

2 Types of Cells

Prokaryotic Cells(proh KAYR ee yah tihk)

No Nucleus cells without membrane-bound

structures EX: bacteria

pond scum

Eukaryotic Cells(yew KAYR ee yah tihk)

Has a Nucleus cells with membrane-

bound structures EX: animals, plants,

fungi and protists