1. 2.1 What is Life?

2. POINT > Identify 6 characteristics of living things
POINT > Identify the elements that are found in living organisms
POINT > Describe 5 types of molecules in living organisms
POINT > Identify 4 things all organisms need
POINT > Define autotroph and heterotroph

3. POINT > Identify 6 characteristics of living things
All living things:
1. Can reproduce
2. Grow and develop

4. POINT > Identify 6 characteristics of living things
3. Respond to the environment
4. Use energy

5. POINT > Identify 6 characteristics of living things
5. Use “chemicals of life” especially DNA
6. Are made of cells

6. CHECK:
Identify 2 characteristics of living things

7. POINT > Identify the elements that are found in living organisms
Living things are mostly composed of 4 elements:

8. POINT > Identify the elements that are found in living organisms
Living things are mostly composed of 4 elements:
Carbon, hydrogen, oxygen, and nitrogen
Other elements are in living things in smaller amounts: P, Na, Cl, S, Fe, Ca, K, etc

9. POINT > Describe 5 types of molecules in living organisms
Water: H2O is required for the chemical reactions that happen inside cells
Proteins do most of the work in the cell. We get protein from animal meat and some vegetables
Carbohydrates (sugars) are used for cell energy. We get most carbohydrates from plants

10. POINT > Describe 5 types of molecules in living organisms
4. Lipids (fats) are important for energy storage Lipids also make up cell membranes
5. Nucleic acids (DNA and RNA) carry the genetic information in living organisms

11. CHECK: Identify the 4 main elements in living things.
What type of molecule is very important in cell membranes?
What type of molecule stores genetic information?

12. CHECK: What molecule helps chemical reactions happen inside of cells?
What type of molecule is used to store energy?
What type of molecule does most of the work inside the cell?

13. POINT > Identify 4 things all organisms need
All living things need:
Water
Energy (from the sun or from eating food)
Nutrients: vitamins and minerals that cells need
A place to live

14. POINT > Define autotroph and heterotroph
All living things need energy. Autotrophs are organisms that get energy directly from the sun*
Autotrophs include plants, algae, and some bacteria
*Some autotrophs get energy from chemicals

15. POINT > Define autotroph and heterotroph
Heterotrophs are organisms that get energy from other organisms
Heterotrophs include animals, fungi, protists and some bacteria

16. CHECK: What are 4 things all living things need? What is an autotroph?
What kinds of organisms are autotrophs?
What is a heterotroph?
What kinds of organisms are heterotrophs?

17. Homework:
Read pages 34-40
Finish the Study Guide. Find the answers in the textbook!
GRAS pages 23-26