1. Characteristics and Classification of Life
Chapter 2
Characteristics
and
Classification of Life

2. Chapter 2A
Life and Cells

3. A complete living thing.
Organism
A complete living thing.

4. Questions for Chapter 2 What is life?
What kind of living thing is the organism?

5. A. Characteristics of Life
I. Life and Cells
A. Characteristics of Life

6. A. Characteristics of Life
1. Organisms have life cycles.
Birth
Growth
Reproduction
Death

7. A. Characteristics of Life
2. Organisms can reproduce.
“after their own kind” (Gen. 1)
3. Organisms grow.

8. A. Characteristics of Life
4. Organisms are made of cells.

9. The smallest living unit of an organism.
Cell
The smallest living unit of an organism.

10. A. Characteristics of Life
4. Organisms are made of cells.
* Cell membrane
* Cytoplasm
* Organic compounds

11. A. Characteristics of Life
4. Organisms are made of cells.

12. A. Characteristics of Life
5. Organisms require energy.

13. Energy
The ability to do work.

14. A. Characteristics of Life
5. Organisms require energy.
* Used for growing, moving, and reproducing
* Even sessile organisms are capable of some type of movement.

15. A. Characteristics of Life
6. Organisms respond to their environment.

16. B. Physical and Spiritual Life
I. Life and Cells
B. Physical and Spiritual Life

17. Physical Life
“A complex organization of nonliving substances that continues by using energy and that has the characteristics of living things.”
page 31, Life Science, BJU Press, 4th ed.

18. B. Physical and Spiritual Life
1. Physical Life
Living things are made of nonliving parts.
* 3/5 of our body is water
* rest of our body is organic substances

19. B. Physical and Spiritual Life
1. Physical Life
b) The nonliving parts require energy to stay organized and continue the characteristics of life.

20. “Physical life is more than a bunch of chemicals being ‘charged’ by energy. Physical life began with the creative act of a wise, loving God.”
page 32, Life Science, BJU Press, 4th ed.

21. “Humans are unique in that they have both a living body and a living spirit.”
page 32, Life Science, BJU Press, 4th ed.

22. B. Physical and Spiritual Life
a) A person must be born again. (John 3:3)
b) A person must grow spiritually. (1 Peter 2:2)

23. C. The Basic Unit of Life: The Cell
I. Life and Cells
C. The Basic Unit of Life: The Cell

24. Cells
Tiny living structures that make up all living things.

25. C. The Basic Unit of Life: The Cell
Very small
Many are specialized

26. C. The Basic Unit of Life: The Cell
3. First observed by Robert Hooke * cork cells * 1665

27. C. The Basic Unit of Life: The Cell Theory
1. All cells come from preexisting cells. 2. All living things are made of cells and the products of cells.

28. C. The Basic Unit of Life: The Cell Theory
3. Cells perform the functions of living things.

29. 4 Basic Cellular Functions
1) All cells use energy. 2) All cells manufacture materials. 3) All cells respond to their environment. 4) All cells reproduce themselves.