1. Chapter 1: Cells

2. 1.1 Cells are the basic unit of living things.
Learning Target:
Explain difference between living and nonliving things;
Describe how microscope lead to the discovery of cells

3. Think.Pair.Share. Brainstorm a list of living and nonliving things.

4. Think.Pair.Share. Brainstorm a list of living and nonliving things.

5. What is the difference between a living and nonliving thing?
Living things use energy.
Living things need food/water.
Most living things move.
Living things can grow.
Living things can reproduce.

6. A living thing is also called an organism.
What is an organism?
A living thing is also called an organism.
Any form of life that can grow and reproduce is called an organism.

7. All organisms are made of cells!
Cell = most basic unit of life
Unicellular = organism made of 1 cell
Multicellular = organism made of many cells
“uni” mean single or one
“multi” means multiple

8. Characteristics of Living Things
There are 5 characteristics that all organisms share:
Organization
Use energy
Grown and develop
Respond/move
Reproduce

9. Characteristics of Living Things
ORGANIZATION
All organisms are made of cells, smallest unit of life.
Levels of cellular organization:
Cells
Tissues
Organs
Organ system
Organism

11. Characteristics of Living Things
All organisms grown and develop from birth into an adult.
Organisms respond to changes in the world around them.
All organisms can reproduce, and create offspring similar to themselves

12. Grow and Develop

13. Respond to changes in environment

14. Reproduce

15. What organisms need to survive?
Organisms cannot grow or reproduce without necessities:
Energy from food and sun
Materials – oxygen, carbon dioxide, water
Living space/shelter

17. Cells are too small to see without a microscope.
Who discovered cells?
Cells are too small to see without a microscope.
Hooke observed tree bark under microscope; first called the “small boxes” “cells”
Leeuwenhoek observed pond water and saw “animulcules” in the water, the first unicellular organisms

20. Cell Theory
Scientific theory = accepted explanation that is supported through evidence

21. Cell Theory

22. Cell Theory Every living thing is made of one or more cells
Cells carry out functions needed to support life
Cells come only from other living cells

23. Who helped prove the cell theory?
Louis Pasteur
Observed that milk turned sour because of unicellular organisms known as bacteria
Developed process, pasteurization, which uses heat to kill bacteria
First called bacteria found in human blood “germs” because it caused sickness

24. Who helped prove the cell theory?
Louis Pasteur
Scientists believed that bacteria grew from nonliving things = spontaneous generation
Conducted an experiment to disprove spontaneous generation.
Proved that cells come from other living cells