1. Biology in the 21st Century
Chapter 1
Biology in the 21st Century

2. Power Notes Fill out during the lecture and use them for study
This narrows down the main ideas.
The rest of the stuff we do, like Study Guides, homework, and Labs, is for practice
You know the saying, “practice makes perfect?”
This definitely applies to learning Biology!

3. BIOSPHERE
All living things and the places they are found on Earth make up the Biosphere.

4. BIODIVERSITY
The variety of living things, called biodiversity, is greatest at the equator.

5. SPECIES
Species describes a group of living things that are reproductively isolated.

6. ORGANISM
Any individual living thing is an organism.

7. CHARACTERISTICS SHARED BY ALL LIVING THINGS:
Made of Cells
Need for Energy
Respond to the environment
Reproduce and Develop
C.E.R.R.D.

8. CELLS All living things are made of one or more cells.
The cell is the “basic unit of life”

9. ENERGY Energy is the ability to do work.
All living things use chemical energy.

10. RESPOND
All organisms must react to the environment to survive.

11. REPRODUCE and DEVELOP
Reproduction results in passing DNA to new individuals.
DNA codes for each individual’s growth and development

12. This course in Biology has four unifying themes
Systems- organized group of related parts that interact to form a whole.
Exist at every level or organization
Structure and function- are always related in living things.
Wings, pinchers, claws, leaves, etc. are shaped for their particular function

13. This course in Biology has four unifying themes
Homeostasis- maintaining a stable internal environment is critical for life.
Stable pH, chemical composition, gas content
Evolution- the change in the genetic make-up of a population over time leads to the formation of new species.
This fact links all levels of biology, and explains both diversity and unity in life.

14. IN-CLASS WORK
Use the rest of the period to complete sections 1.1 and 1.2 in your study guide (pages 1-4). BE SURE YOUR NAME IS WRITTEN IN INK ON THE COVER OF YOUR STUDY GUIDE

15. OBSERVATION
Involves perceiving the world with one or more of our 5 senses
Can be direct or with an instrument, like a thermometer or a microscope.

16. Inference
Deriving a conclusion about an observation using logic Inferences cannot be directly observed. They require thought. An inference is a statement based on your interpretation of the facts.

17. Observation and Inference
List the observations you can make in the picture.
“Just the facts”
What can you infer?
What you “read into” an observation

18. More observations may alter inference
List additional observations
Does this change or support your previous inference?

19. And more observations can support or change earlier inferences.

20. HYPOTHESIS More than an “educated guess”
It has to be a prediction that can be tested.
It sets up the study or experiment
An easy way to set up a hypothesis is by using an IF-THEN statement
Example: IF I study key words every week, THEN I will earn an A on the Biology exam.
HYPOTHESIS

21. Today’s In-Class Assignment.
Todays KEY WORDS (listed on page 9 of the study guide):
observation
hypothesis
Independent variable
constant
data
experiment
Dependent variable
Theory
Study Guide:
ALL pages 5 and 6 (1.3)
#6-7 page 8 (1.4)
6,7,8 page 10 (1.5)