Ch. 2
CELLS
Pre-Assessment
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?
1)
Correct Answers
1.
2.
3.
4.
5.
6.
D
D
A
D
A
Metabolism, Growth, Reproduction,
Response, Homeostasis, Nutrition
Ch. 2 Word Splash
stem cells
metabolism
reproduction
response
Homeostasis
nutrition
differentiation
prokaryotic
eukaryotic
binary fission
Cell Theory
growth
active transport
PASSIVE TRANSPORT
exocytosis
cell division
cell cycle
MITOSIS
endocytosis
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
Schleiden = plants have cells
Leeuwenhoek = high magnification
and “animalcules”
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 Sizes
The 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