Post on 24-Dec-2015
transcript
Adapted from Pearson/Prentice Hall Science Explorer: Cells and Heredity
Cell Structure and Function
Cells are the basic unit of
structure and function for all
living things.
Some living organisms have only one cell and
some have trillions.
www.ucmp.berkeley.eduwww.ucmp.berkley.edu
Elodea Cell
Red Blood Cells
Before we knew anything about cells, people believed in a theory called “Spontaneous Generation.” The theory states that living things can come from non-living things. Oddly, the theory made sense to many.
Frogs came from mud, after all, there are frogs by ponds .
Mice came from straw, after all, all barns and houses had straw and mice.
Maggots came from rotting meat, after all, there were always maggots on rotting meat.
maestroviejo.wordpress.com
First Microscope
The microscope changed everything. It redefined what we thought, what we knew, and even who we were. A microscope is an instrument that uses curved glass to bend light and magnify objects. It was invented in the late 1590s. Many used light to illuminate objects and more than one lens to magnify. These are called compound microscopes.
Robert Hooke’s Microscope
www.micro.magnet.fsu.ed
The Cell Theory1. All living things are made of cells.2. Cells are the basic unit of structure and function of living things.3. All cells are made from other living cells.
As with many scientific discoveries, the Cell Theory was revolutionary for its time.
http://technologybiology.blogspot.com/2011/05/,anton-van-leeuwenhoek.html, internetlooks.com, technologybiologyblogspot.com
Anton Van Leeuwenhoek observed living cells he called ‘animalcules.’
Van Leeuwenhoek’s first animalcule diagrams and microscope
Cell Wall
Cell Membrane
Cell Wall1. Function – protect cell, support cell so plant can stand up straight2. Touch but flexible3. Made of cellulose
Cell Membrane1. Function – to control what enters and exits cell2. Selective permeability – to ability to select what substances enter and exit cell3. In both plant and animal cells
Bmswestfordk12.us, dymzwordl.com
Cytoplasm
Nucleus
Cytoplasm1. Function – to cushion organelles, give body and support to cell2. Gel like substance in the area between the nucleus and cell membrane
Nucleus1. Function – to direct all cell activity2. Functions like a brain or operative system in a computer3. Contains chromatin, DNA, coded instructions
Bmswestfordk12.us
Endoplasmic Reticulum
Mitochondria
Mitochondria1. Function – to make energy for the cell2. Power house3. Rod, peanut shaped4. Number of mitochondria depends on how much energy the cell needs
Endoplasmic Reticulum1. Function – transports protein 2. Maze of tubular passage ways
Bmswestfordk12.us
Ribosome
Golgi Bodies
Ribosome1. Function – makes protein2. Located either on the endoplasmic reticulum or floating freely in cytoplasm
Golgi Bodies1. Function – to package and transport different substances needed by cell2. Flatten groups of sacs and tubes3. Acts like “UPS’
www.pleasanton.k12.ca.us
Vacuole
Lysosome
Vacuole1. Function – holds substances, acts like a storage tank2. Holds mostly water and food3. Vacuoles in plants are big
Lysosome1. Function – to digest or recycle material in cell2. Small and round3. Contains enzymes that actually break down substances4. Responsible for tadpole legs disappearing as frog grown bigger
1. Function – container for chlorophyll, serve as site for photosynthesis2. Function of chlorophyll is to capture energy from sun so that plant can make its own food3. Photosynthesis – the process by which plants make their own food4. Glucose is a type of sugar5. Always green6. In plants and a few single celled animals
Plant Cell Diagram
Chloroplast
Actual Chloroplasts
Plant and Animal Cell Comparison
Plant Cells 1. Chloroplasts2. Larger Vacuoles3. Cell Membrane4. Regular Shape5. Always Green
Animal Cells1. No Chloroplasts or
green color2. Smaller Vacuoles3. Irregular Shape
Vocabulary – What do you know?
1. Cell - 2. Organelle - 3. Compound Microscope -4. Cell Wall - 5. Cell Membrane - 6. Selective Permeability - 7. Nucleus - 8. Chromatin - 9. Nucleolus - 10. Cytoplasm - 11. Mitochondria - 12. Endoplasmic Reticulum - 13. Ribosome - 14. Golgi Bodies - 15. Chloroplast - 16. Vacuole - 17. Lysosome -