Bell work Objectives:

What does the word “Biology” mean?

Bio- life

-ology- “the study of”

I will:

Preview unit 2 “Cells and Homeostasis” and set up my ISN.

Review the history of the discovery of cells.

Updating your Notebook

http://edweb.tusd1.org/vfrazier/ISN.htm

Tape your quiz on page 32

Double check that you have every assignment on the correct page-

Unit 2: Cells & Homeostasis

Unit Over View: Page 33

What do you know??

Look at the unit overview handout-

Key Concepts:

Cell Theory Prokaryotes vs. Eukaryotes Plant cells vs. Animal Cells

Organelle structure and function

Fluid Mosaic Model

Passive Transport

Diffusion

Osmosis

Active Transport

Cellular

Homeostasis

Vocabulary

For each of the vocabulary words- put a (+) = Can explain it; (-) = Only heard it; 0 = No idea in the “PRE” column.

Fold the page on the

line

Attach to page 33

2

Unit 2- Table of Contents

Page 34

Left Side Items Page

Right Side Items Page

1. Unit 2 Overview 33 1. Table of Contents 34

2. Unit 2 Vocabulary 35 2. Unit 2 Vocabulary 36

3. 37 3. 38

4. 39 4. 40

5. 41 5. 42

6. 43 6. 44

Page 35 & 36: Unit 2 Vocabulary Word Definition Picture

Closing Question

What is one thing that you don’t know from our unit 2 key concepts? What is one thing that you have heard of before?

The Discovery of Cells

Notes: Add to Page 35

Brainstorm: white board/group activity

Cell

Closing Question

What is one thing you already know about cells? What is one topic you didn’t know about cells while previewing the unit?

The Discovery of the Cell

Cell theory video questions:

1. T or F Scientists can only make discoveries in a laboratory with white lab coats and science gizmos that go beep.

2. Why do you think there were so many heated debates around the development of the cell theory?

3. There are three parts to the cell theory. Which is NOT one of those parts?

A. All organisms are composed of one or more cells.

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

C. Cells spontaneously arise from carbon and nutrients carried in the bloodstream.

D. All cells come from pre-existing cells.

Video Questions…

4. Anton van Leeuwenhoek made his own version of the microscope and discovered something very odd when he looked a the gunk on his teeth. What did he discover? A. Cells

B. Bacteria

C. Cavities

D. Influenza

5. Who named the cell? A. Robert Hooke

B. Robert Redford

C. Robert Smith

D. Robert DeNiro

Video Questions… 6. Which scientist realized that, by studying

samples under a microscope, all animals are made up of cells?

A. Rudolf Virchow B. Robert Remak C. Theodor Schwann D. Isaac Newton

7. If you could invent one "science gizmo," what would it be? Do you think your invention would lead to any discoveries that would change our understanding of science?

8. Describe a time when collaboration worked well for you. Where there ever any disagreements that led to a false assumption (like cells spontaneously crystallizing into existence)?

The Cell Theory

The cell theory states:

1. All living things are made up of cells.

2. Cells are the basic units of structure and function in living things.

3. New cells are produced from existing cells.

How were cells discovered?

Microscopes!

How do microscopes work?

produces an enlarged image of something very small. (zooms in)

Most microscopes use lenses to magnify the image of an object by focusing light or electrons.

T-Chart: Light Microscopes and Cell Stains

Technology: 1. Light Microscope 2. Stains 3. Fluorescent dyes

4. Transmission Electron Microscope

5. Scanning Electron Microscope

Benefits: enlarged image Makes cell parts visible makes it possible to

see and identify the locations certain molecules

make it possible to explore cell structures and large protein molecules

Produces three-dimensional images of the specimen’s surface

Biology Book Page 191-192

Which microscope was used for each picture?

Scanning Electron Microscope?

Light Microscope?

Transmission Electron Microscope?

A B C

Using a Microscope

The parts of a microscope:

http://www.youtube.com/watch?v=RKA8_mif6-E

Focusing a microscope:

http://www.youtube.com/watch?v=scEhgAiazzU

Recording what you view:

What Is a Cell? Page 36

1. Look through a microscope at a slide of a plant leaf or stem cross section. Sketch one or more cells. Record a description of their shape and internal parts.

2. Repeat step 1 with slides of nerve cells, bacteria, and paramecia.

3. Compare the cells by listing the characteristics they have in common and some of the differences among them.

Analyze and Conclude

1.Classify the cells you observed into two or more groups. Explain what characteristics you used to put each cell in a particular group.

Prokaryotes and Eukaryotes

Eukaryotes (yoo kar ee ohts)

are cells that enclose their DNA in nuclei.

Prokaryotes (pro kar ee ohts)

are cells that do not enclose DNA in nuclei.

Prokaryotes and Eukaryotes- what do they have in common?

All cells have the following parts:

Cell membrane

Cytoplasm

Ribosomes

Genetic material (DNA)

Prokaryotes vs. Eukaryotes Venn Diagram

Prokaryotes Eukaryotes

similarities