2. 1.1 Cells and Life light microscope cell theory homeostasis protein
nucleic acid
lipid
carbohydrate

3. Early Ideas About Cells
1.1 Cells and Life
Early Ideas About Cells
Most cells can only be seen with a microscope.

4. Early Ideas About Cells (cont.)
1.1 Cells and Life
Early Ideas About Cells (cont.)
Most cells can only be seen with a microscope.

5. Microscopes Early microscopes
1.1 Cells and Life
Microscopes
Early microscopes
A light microscope uses light and has one or more lenses that enlarges an image of something.
Modern microscopes
An electron microscope can enlarge images 100,000 times or more.

6. Cell Theory All organisms are made of cells.
1.1 Cells and Life
Cell Theory
All organisms are made of cells.
The cell is the smallest unit of life.
All new cells come from pre-existing cells.

7. Characteristics of Life
1.1 Cells and Life
Characteristics of Life
All organisms have common characteristics such as:
organization
responses
growth and development
reproduction
maintain homeostasis
use energy

8. Chemistry of a Cell The molecules in living things are made from:
1.1 Cells and Life
Chemistry of a Cell
The molecules in living things are made from:
Sulfur
Nitrogen
Potassium
Hydrogen
Oxygen
Carbon

9. Water—The Main Ingredient
1.1 Cells and Life
Water—The Main Ingredient
2/3 of our body mass
Inside cells and surrounds cells
Allows transport of substances in blood

10. Water—The Main Ingredient (cont.)
1.1 Cells and Life
Water—The Main Ingredient (cont.)
Water molecules have negative and positive ends that attract each other.
Under what conditions do cells gain or lose water?

11. Basic Substances in Cells
1.1 Cells and Life
Basic Substances in Cells
Macromolecules:
Proteins
Nucleic acids
Lipids
Carbohydrates

12. Proteins Folded chains or groups of folded chains of amino acids
1.1 Cells and Life
Proteins
Folded chains or groups of folded chains of amino acids

13. Nucleic Acids Long chains of molecules called nucleotides DNA RNA
1.1 Cells and Life
Nucleic Acids
Long chains of molecules called nucleotides
DNA
RNA

14. Lipids Lipids do not dissolve in water. The main kinds include: fats
1.1 Cells and Life
Lipids
Lipids do not dissolve in water.
The main kinds include:
fats
phospholipids
steroids
waxes

15. Carbohydrates Made of one or more sugar molecule Store energy
1.1 Cells and Life
Carbohydrates
Made of one or more sugar molecule
Store energy
Make up the structural parts of cells

16. Where do new cells come from? A the food we eat B our parents
1.1 Cells and Life
Where do new cells come from?
A the food we eat
B our parents
C preexisting cells
D carbohydrates
Lesson 1 Review

17. Which is a characteristic of organisms? A birth B death C respiration
1.1 Cells and Life
Which is a characteristic of organisms?
A birth
B death
C respiration
D organization
Lesson 1 Review

18. How much of our body mass is water? A 90% B 75% C 66% D 30%
1.1 Cells and Life
How much of our body mass is water?
A 90%
B 75%
C 66%
D 30%
Lesson 1 Review

19. End of Lesson 1