1. Cells – Section 1 The World of Cells A. Cells help living creatures with activities of life such as movement, growth, and reproduction. A.The cell theory developed after Robert Hooke invented the microscope in 1665 B.All living things are made of cells C.The cell is the basic unit of life D.All cells come from cells that already exist.

2. Bacteria are one-celled organisms; larger organisms are made of many cells, sometimes trillions of cells. Bacteria are one-celled organisms; larger organisms are made of many cells, sometimes trillions of cells. A microscope's magnification is found by multiplying the powers of the eye piece and the objective lens. A microscope's magnification is found by multiplying the powers of the eye piece and the objective lens.

3. Cells are composed of parts that do specific jobs. Cells are composed of parts that do specific jobs. –The flexible cell membrane is the boundary of the cell and helps control what enters and exits the cell. –Some cells have cell walls that help support and protect the cell.

4. Cytoplasm is a gelatinlike substance containing many chemicals the cell needs. Cytoplasm is a gelatinlike substance containing many chemicals the cell needs. Specialized cell parts called organelles do various jobs within a cell. Specialized cell parts called organelles do various jobs within a cell. The nucleus contains hereditary material called chromosomes. The nucleus contains hereditary material called chromosomes. Vacuoles are storage organelles for food, water, and wastes. Vacuoles are storage organelles for food, water, and wastes. (GO TO WEBSITE) (GO TO WEBSITE)

5. Inside the mitochondria, cellular respiration uses oxygen to convert food energy into a form the cell can use. Inside the mitochondria, cellular respiration uses oxygen to convert food energy into a form the cell can use. 1. Waste products of cellular respiration are carbon dioxide and water. 1. Waste products of cellular respiration are carbon dioxide and water. 2. Leaf cells in plants contain chloroplasts that help the cell make its own food through photosynthesis. 2. Leaf cells in plants contain chloroplasts that help the cell make its own food through photosynthesis.