1. Notes Chapter 1.3
Studying Life

2. Biology
The study of life
Bio- “life”
-ology “the study of”

3. Characteristics of all living things:
Are made of cells

4. Characteristics of all living things:
Are based on a universal genetic code written in molecules of DNA

5. Characteristics of all living things:
Obtain and use materials and energy
Materials are needed for growth, development, and reproduction.
All chemical reactions that occur in the body are known collectively as metabolism.

6. Characteristics of all living things:
Grow and develop
These occur when cells divide, differentiate, and specialize

7. Characteristics of all living things:
Reproduce
Sexual reproduction: cells from 2 parents unite to form the 1st cell of a new organism which is genetically different from both parents
Asexual reproduction: a single organism produces offspring identical to itself

8. Characteristics of all living things:
Respond to surroundings
Stimuli – signals that organisms respond to

9. Characteristics of all living things:
Maintain internal stability
Homeostasis: maintaining a stable internal environment despite changes in the external environment

10. Characteristics of all living things:
Change over time – evolve