Ch. 2CELLS

Pre-Assessment1)  What did Leeuwenhoek do? A. looked at cork B. stated that animals

are made of cells C. all plants are made of cells D. used simple light microscope and saw microorganisms

2)  Schwann did which of the following? A. He said that plants are not made of cells B. Said that animals aren't made of cells C. Stated that all plants have cells D. Stated that all animals have cells

3)  Robert Hooke was...? A. the first to see a cell, and named it a cell B. said that all plants are multicellular C. said that the beginning unit is always a cell D. was the 2nd person to see a man on earth

4)  What did Schleiden find out? A. All animals are made of cells B. He was the first to see a cell under a microscope C. All animal cells have different functions D. All plants are made cells

5)  What does the Cell Theory state? A. That all living things are made of cells B. Every cell has only one nucleus C. All cells are composed of atoms D. animals are only ones that have cells

6) What are the 6 functions of life?

Correct Answers

1. D2. D3. A4. D5. A6. Metabolism, Growth, Reproduction,

Response, Homeostasis, Nutrition

Ch. 2 Word SplashCell Theory stem cells metabolism

growth reproduction responseHomeostasis nutrition differentiationprokaryotic eukaryotic binary fission

PASSIVE TRANSPORT active transport

cell division endocytosisexocytosis cell cycle

MITOSIS

Cell Theory

Three main principles of cell theory are:• all organisms are composed of one or more cells• cells are the smallest units of life• all cells come from pre-existing cells

*A Short History of Nearly Everything: Ch. 24 Cells*

Hooke = cells Leeuwenhoek = high magnification and “animalcules”

Schleiden = plants have cells Schwann = all animals have cells

Evidence to Support the Theory

The theory has high credibility due to:• The invention of the microscope• Hooke-1665 observing first cell in cork• Leeuwenhoek- 1675 observed first living cells• Schleiden- 1883 stated plants made of cells• Schwann-1884 stated animals made of cells• Pasteur-1860’s chicken broth experiment

Functions of Life• Metabolism -

• Growth -

• Reproduction -

• Response -

• Homeostasis -

• Nutrition -

Using the six functions of life, come up with your own unique (but appropriate) acrostic to help you remember.

I will give you a few minutes and then we will share.

Cell SizesThe relative sizes in decreasing order:• Cells ≤ 100 micrometers (100 x 10-6 m)• Organelles ≤ 10 micrometers (10 x 10-6 m)• Bacteria ≤ 1 micrometers (1 x 10-6 m)• Viruses ≤ 100 nanometers (100 x 10-9 m)• Membranes ~ 10 nanometers (10 x 10-9 m)• Molecules ~ 1 nanometers (1 x 10-9 m)

Activity

• Draw a picture which contains the items in their correct order (largest to smallest or smallest to largest)

• Add color• Label with names and approximate sizes• You have 20 minutes to complete this task