1. Characteristics of Life

2. The Meaning of Biology…
“Bio” – LIFE
“logy” – The study of
So…Biology is the study of life
List 3 things we could study this year:

3. Characteristics (write these next to Chracteristics of Life)
Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Responsiveness
Growth and Development

4. Cell All living organisms are made of and develop from cells
smallest unit of an organism that can perform all life’s processes
All living organisms are made of and develop from cells
Unicellular (one cell) Multicellular (many cells)
Cell has to do all jobs all cells have particular jobs cells specialize—have unique jobs
Cells differentiate (do different
jobs)

5. Cellular Organization
Organization—high degree of order (internal and external parts) and in its interactions with the living world

6. Homeostasis ( temperature, water levels, salt, pH, etc.)
All organisms want a stable internal environment.
All living things have mechanisms that allow them to maintain stable internal conditions
( temperature, water levels, salt, pH, etc.)

8. Example: Exercise lab… …Why?

9. Homeostasis Lab
What were the types of data you collected from the person who exercised?
Why did the person
Turn red?
Breath harder?
Increase in pulse rate?
Sweat?
All of these events work together to maintain what homeostatic level in your body?

10. Metabolism
Use energy
the sum of all the chemical reactions that take in and transform energy and materials from the environment

11. Reproduction organisms produce new organisms like themselves
Passing genes to offspring;
organisms produce new organisms like themselves
Genes must be passed on for survival of species, not the individual

12. Asexual vs. Sexual Asexual Sexual
+ convenient—takes only -- not convenient
one : splits in two —takes must survive
find a mate
attract a mate mate successfully successful offspring
--no genetic variety (clone) + genetic variety

13. Interdependence of organisms
Organisms interact with other organisms and environment
Examples: flower and insect – they need each other to survive
E. coli and human intestines

15. Growth and Development
Growth results from the division and enlargement of cells
Development process by which an organism becomes a mature adult

16. Responsiveness
Responds to stimuli

17. Heredity
Passing genes from one generation to the next

18. Evolution Definition: change over time or generations
Done by natural selection: “fit will survive” Best genes passed on
Have genes which help organism survive in environment

19. Cheetah example – faster one gets food, so is able to survive and reproduce

21. Hypothesis:
An interpretation of a practical situation or condition taken as the group for action. Writen in an IF/THEN statement

22. Theory:
The analysis of a set of facts in their relation to one another. Has not been proven completely true.

23. Law:
A rule or order that has been completely proven true by facts.