TOPIC: Cell discovery & Cell theory Obj: 1-4

AG

EN

DA

• Wk 16 WIR-ADD DW points

• Go over 7.1 RDG Qs

• 7.1 Guided Notes

• HW: 7.2 Book Pages/RDG Q’s

ABSEN

T

HANDOUTS to PICK-UP:

-7.1 Guided Notes

-7.2 BP & RQ

SEMINAR

EXT: DUE:

DO NOW:How did the development of the microscope change how

scientists studied living organisms?

DW: 7.1 Reading Question

EXIT: Circle your level of understanding AND Explain what you think Hooke would have

seen if he had looked at living cells.

1--- SUMMARIZE the principles and discoveries of the cell theory.

2--- DIFFERENTIATE between prokaryotic cells and eukaryotic cells.

3--- DISCUSS the relationship between the cell shape and cell function.

4--- DESCRIBE the relationship between atoms, cells, tissues, organs, and organ

systems.

(ORGANIZATION-pg 8 in text)

Today’s Objectives

Vocabulary

These should

be done by

test day!

cell

cell theory

organelle

eukaryotic cell / prokaryotic cell

nucleus

Reading Questions

VOCABULARY TERMS!

Define:

Organization-

The orderly structure of cells in an organism

Cells-

Basic units of living organism

HISTORY OF THE CELL

• Before microscopes were invented, people thought that curses and spirits caused disease

• Scientists started using microscopes, and soon discovered CELLS

-the basic unit of living organisms

• Started with a Compound Light Microscope

-Utilizes a series of glass lenses and visible light to magnify an image

-Magnifies images up to 1,000 times the actual size

History

• In the 1600s, Anton van Leeuwenhoek was

the first to observe tiny living animals

swimming in a drop of water using a

primitive microscope. First person to develop

working microscope.

• In the 1600s, Robert Hooke observed thin

slices of cork and noticed individual

compartments that reminded him of

monastery “cells” (small rooms that the

monks stayed in). Hence the name cells.

History Cont.

After a long career of making observations of

cells, Rudolph Virchow concluded that all

cells must come from other living cells.

In the 1800’s, Matthias

Schleiden concluded that

all plants were composed

of cells.

• Theodor Schwann concluded that all

animals were composed of cells.

(Schwann = swans)

History Cont.

With your neighbor, complete the following portion of your notes.

History Cont.

READ the three main ideas of the cell theory. WRITE a statement

for each one describing the idea.

Cell Theory

Made up of 3 main ideas-

1. All organisms are composed of 1 or more cells

-Sometimes cells are unicellular (Leeuwenhoek)

-most are multicellular

2. The cell is the basic unit of structure and organization of organisms

-No matter size or shape, cells are still the basic component of

any organism

3. All cells come from preexisting cells

-before cell theory, no one knew where cells came from

-Cell theory tells us that cells split and divide into 2

MICROSCOPE TECHNOLOGY

Electron Microscope

• Magnifies images up to 500,000 times the actual size

• Utilizes magnets to aim a beam of electrons at a cell to produce an image

MICROSCOPE TECHNOLOGY

CALCULATE: if each lens in this example magnified the image 20x,

what is the total magnification? (SHOW WORK)

20 x 20 = 400

MICROSCOPE TECHNOLOGY

ANALYZE how more sophisticated microscopes have allowed

scientists to advance their knowledge of cells.

BASIC CELL TYPES

Prokaryotic Cells

• Simple in structure

• Has a plasma membrane

• Does not have membrane

bound organelles

• Small

• No Nucleus

• EX: Bacteria

Eukaryotic Cells

• More complex structure

• Has a plasma membrane

• Has membrane bound

organelles

• Large

• Nucleus present

• EX: Plant & Animal

AGENDA

Complete 7.1 Guided Notes

Complete 7.2 Book Pages & RDG Qs

EXIT

EXIT: Circle your level of understanding AND

Explain what you think Hooke would have seen

if he had looked at living cells.