1. The Building Blocks of Life
Chapter 1: Cells
The Building Blocks of Life

2. What is Life?
Ideas?

3. Which of the following are living things?
Dog
Moss
Car
Mildew
Water

4. Living Things –have 6 characteristics
Have a cellular organization
Contain similar chemicals
Use energy
Grow and develop
Respond to their surroundings
Reproduce

5. 1. Cellular Organization
All organisms are made up of cells. Cells are the basic unit of structure and function in an organisms.
Unicellular Organisms - organisms made up of one cell
Ex: Bacteria (These are the most numerous organisms on earth.)
Multicellular Organisms - organisms made up of many cells. There are many different types of cells and each type has its own functions.
Ex: Brain cell, nerve cell

6. 2. Contain Similar Chemicals
Water-most common
Carbohydrates-energy source
Proteins-building blocks of cells (hair, muscles, fingernails)
Lipids-building blocks of cells
Both carbohydrates and lipids are made up of O, H and C.
Nucleic acids-genetic material, instructions

7. 3. Use Energy To grow and repair
You use energy to breath, digest, think, move, heal

8. 4. Grow and Develop
Development-Process of change that occurs during an organisms life to become more complex.
Brainstorm: How do lving things grow and develop?

9. Response to Surroundings
Stimulus -a change in surrounding that causes an organism to react
Example: changes in temperature, light, sound, etc.
Response -the organism’s response or action to the stimulus or change
Example: A tree bends towards sunlight

10. Reproduction
Reproduction- produce offspring similar to parents

11. Living Things need 4 Things
Energy
Water
Living Space
Stable Internal Conditions

12. 1. Energy
Food!
Plants are autotrophs. Autotrophs are self- feeders. They make their own food out of energy from the sun and CO2
Heterotrophs (“other feeders”) eat autotrophs or other heterotrophs to receive energy from the sun in an indirect way.

13. 2. Water
Water is needed to obtain chemicals from surroundings, break down food, grow, and move substances in body. (92% of blood is water.)

14. 3. Living Space
Living things must share and compete for living space.

15. 4. Stable Internal Conditions
The surroundings of living things change, but they must keep stable internal conditions.
Homeostasis-the maintanance of stable internal despite changes in surroundings
Ex: Body temperature
Ex: Barnacle-wet vs. dry

16. Read pg together

17. Big Idea Questions
What are the six characteristics of all living things?
What four things do all living things need?
Describe a controlled experiment.

18. Vocabulary Organism Cell Unicellular Multicellular Development
Stimulus
Response
Reproduce
Spontaneous generation
Controlled experiment
Manipulated variable
Autotroph
Heterotroph
homeostasis