(c) mcgraw hill ryerson 2007 1.2 cells an analogy is a way to understand new ideas by making a...
TRANSCRIPT
(c) McGraw Hill Ryerson 2007
1.2 Cells
• An analogy is a way to understand new ideas by making a comparison.
• A factory can be used as an analogy for the cell.• Parts of the cell that allow the cell to survive are
called organelles.• Organelles take up about 5 to 30 percent of the cell.
The rest of the cell consists of water.
See pages 22 - 24
(c) McGraw Hill Ryerson 2007
The Functions of Cell Organelles
• The cell membrane protects the cell and regulates the movement of particles in and out of the cell.
• Cytoplasm, the jelly-like substance within the cell, contains organelles, water, and other life supporting materials.
• The nucleus: controls all the activities within the cell. contains deoxyribonucleic acid (DNA).
See page 25
(c) McGraw Hill Ryerson 2007
Energy in the Cell
• The mitochondria are the organelles that produce energy in the cell.
• When the cell changes chemical energy, in the food we eat, to energy the cell can use, it is called cellular respiration.
• The total of all the chemical reactions that take place in our cells is called our metabolism.
See page 26Cellular Respiration
(c) McGraw Hill Ryerson 2007
Organelles for Assembly, Transport, and Storage
See pages 28-29
• Proteins are essential for all life and are assembled by the ribosomes.
• Proteins then pass through the endoplasmic reticulum and are placed in vesicles by the Golgi body.
• Vacuoles are temporary storage compartments.
• Lysosomes break down food particles, cell wastes, and worn-out organelles.
(c) McGraw Hill Ryerson 2007
The Difference Between Plant and Animal Cells
See pages 29-30
• Plant cells have two parts that are not found in animal cells: Cell Wall
protects the cell and gives cell shape Chloroplasts
change the Sun’s energy into chemical energy
Photosynthesis
Locate the cell wall and chloroplast
(c) McGraw Hill Ryerson 2007
Cell Theory
See pages 31-32
• The cell is the basic unit of life.• All organisms are composed of one or more cells.• All cells come from other living cells.
(c) McGraw Hill Ryerson 2007
Prokaryotic and Eukaryotic Cells
See page 32
Cells are classified into two groups:Prokaryotic cells have organelles that are not surrounded by membranes.
Eukaryotic cells have organelles that are surrounded by membranes. Eukaryotic cells are usually larger than prokaryotic cells.
(c) McGraw Hill Ryerson 2007
Bacteria and Viruses
Bacteria are prokaryotic cells.• Some bacteria cause diseases such as:
tuberculosis and strip throat.• Helpful bacteria are used to make food
such as: cheese and yogurt.• Bacteria are often grouped by the shape
of their cells.
Viruses are not living.• HIV, chicken pox, and the flu are
examples of viruses.• Viruses do not contain any cell organelles
but reproduce by using a host cell.See pages 33 - 34