Cell Theory 1 2 3 The cell is
- Slides: 27
Cell Theory 1. 2. 3. The cell is the basic unit of life All organisms are composed of one or more cells. All cells come from pre-existing cells.
What does a cell look like? Draw and label what you can remember about a cell. There are no wrong or right answers
Is this what you remember?
The Two Types of Cells
Today’s Lesson Focuses On: Prokaryotic Cells n Eukaryotic Cells n The differences between prokaryotic and eukaryotic cells n Organelles and their functions n
Prokaryotic Cells
Prokaryotic Cells: Lack a nucleus n Cell’s DNA floats in the middle of the cell. n Do not have organelles n They do have ribosomes. n Are also known as bacteria. n
Eukaryotic Cells
Eukaryotic Cells
Eukaryotic Cells: n n n n 10 time larger than prokaryotic cells Include: plant, animal, fungi, and protists Have a nucleus and many other membranecovered organelles DNA is stored in the nucleus of the cell The DNA molecules are linear All eukaryotic cells have a cell membrane Some have a cell wall
Comparison of The Two Types of Cells Prokaryotic Cells Eukaryotic Cells
Comparison of The Two Types of Cells Prokaryotic Cells n No nucleus n No membranecovered organelles n DNA floats around (circular) n Bacteria n n Eukaryotic Cells Nucleus Membrane-covered organelles DNA in nucleus (linear) All other cells ( plant, animal, fungi, protists)
Animal DNA – Double Helix
Eukaryotic Cells: The Inside Story
Eukaryotic Cells What is an organelle? An organelle is a structure within a cell, sometimes surrounded by a cell membrane. They are structures that allow the cell to live, grow, and reproduce.
Organelle’s and Their Functions n Nucleus Contains the cell’s DNA and is the control center of the cell
Organelle’s and Their Functions n Chloroplasts Make food using energy from the sunlight
Organelle’s and Their Functions n Golgi Bodies Processes and transports materials out of the cell
Organelle’s and Their Functions n Vacuole Stores water and other material
Organelle’s and Their Functions Lysosomes n Digestive system for cell
Organelle’s and Their Functions n Mitochondria Break down food molecules to make ATP (energy)
Organelle’s and Their Functions n Endoplasmic Reticulum Breaks down lipids, drugs and other substances, packages up proteins for release from the cell
Organelle’s and Their Functions Ribosomes The site where amino acids are hooked together to make proteins
Cell Wall.
Cell Wall Only found in plant cells and bacteria (prokaryotic cells). n They are tough, outer coverings that protect the cell and give it shape n
Cell Membrane Protective layer around all cells. n It allows things to come in and out of the cell. n ( Like a flood gate) n Made of a phospholipid bilayer n
Cell Membrane