THE CELLTHE CELL

Chapter 7Chapter 7

Robert Hook (1665)Robert Hook (1665)

EnglishmanEnglishman corkcork ““cells”cells” Compound Compound

microscopemicroscope

Anton van Leeuwenhoek Anton van Leeuwenhoek (1660’S)(1660’S)

HollandHolland Single lens Single lens

microscopemicroscope Pond waterPond water

CellsCells

Basic units of lifeBasic units of life

Matthias Schleiden Matthias Schleiden (1838)(1838)

German botanistGerman botanist Plant cellsPlant cells

Theodor Schwann (1839)Theodor Schwann (1839)

German biologistGerman biologist Animal cellsAnimal cells

Rudolf Virchow (1855)Rudolf Virchow (1855)

German physicianGerman physician New cells could only New cells could only

come from the division come from the division of existing cellsof existing cells

Cell TheoryCell Theory

All living things are compose of cellsAll living things are compose of cells Cells are the basic units of structure and Cells are the basic units of structure and

function in living thingsfunction in living things New Cells are produced from existing New Cells are produced from existing

cellscells

Lots of different shapes Lots of different shapes and sizes of cellsand sizes of cells

SizesSizes

5 to 50 micrometers5 to 50 micrometers How big is a micrometer?How big is a micrometer? 1m=100cm=1,000,000 micrometers1m=100cm=1,000,000 micrometers 1 micrometer=.000001m1 micrometer=.000001m Basically you can’t see itBasically you can’t see it Remember: KHDmDCM..micro..nano..picoRemember: KHDmDCM..micro..nano..pico

Chaos chaos Chaos chaos Largest protozoanLargest protozoan You can see without You can see without

microscopemicroscope 1000 micrometers1000 micrometers How many meters is this? How many meters is this?

.001 m.001 m How many centimeters is How many centimeters is

this?this? 0.1 cm0.1 cm

2 things in every cell…2 things in every cell…

Surrounded by a barrier, cell membraneSurrounded by a barrier, cell membrane At some point in their life they contain….At some point in their life they contain….

DNADNA