Welcome to Jennifer’s Web-folio & Learning Tutorial. Unit I- Life’s Building Blocks. Unit II-Energy & Matter for Life. Unit III-Continuity of Life. Unit IV-Interactions & Interdependence. Unit I-Site Map. Topic 1-Simple Organisms. Key Ideas-Topic 1.
Welcome to Jennifer’s Web-folio & Learning Tutorial Unit I- Life’s Building Blocks Unit II-Energy & Matter for Life Unit III-Continuity of Life Unit IV-Interactions & Interdependence
Key Idea 1- Organisms Possess Many Similarities • -They all have cells.(every living thing) • -Every living thing performs metabolic activities (transport,respiration,reproduction, nutrition, and excretion) • - Every living thing depends on other living thing in order to survive in the environment
Prokaryotic - Very primitive cell structure that lacks cell organelles - Kingdom monerans (blue-green algae and bacteria) Eukaryotic - Cells that have a nucleus with DNA inside and other cell organelles -1celled organisms such as Paramecium,Amoeba,and the Euglena (Kingdom protista ) Key Idea 2-Simple Organisms lack a cellular organization and can either be prokaryotic or eukaryotic.
Antibacterial Soaps Do they really work?
Antibacterial Soap-Introduction • In this lab you will be trying to figure out which hand soap is more efficient in killing bacteria. You can choose any two kinds of antibacterial soap I chose the soap from the men’s bathroom and the soap from the women’s bathroom. You will be making three culture dishes. One dish will be a control containing just soil, one dish with soil and one kind of soap, and the last culture dish will contain soil and the other kind of soap.
Problems to Investigate • - Which soap is more effective at inhibiting bacteria? • - Will the bacteria develop a resistance to the antibacterial soap?
Background Information1-Research Research on Antibacterial Soaps: • -The purpose of antibacterial soaps are to kill bacteria. • -Bacteria can develop a resistance to the antibacterial soap. • -When the bacteria develops a resistance to the soap if you added more of the same soap the bacteria wouldn’t be harmed by the soap.
Background Info:2-Prior Experiments • - We observed a different experiment involving the same procedure but different soaps. We used dial and waterless soap(germ-x/purell) • - The waterless soap didn’t kill bacteria as good as everyone thought it would. The dial worked the best.
Hypothesis • - Based on the back round information, I think that women’s soap will be more effective. • - I also think that the bacteria in the dish with the men’s soap will develop a resistance. • - Therefore, I think we will see many different species growing and competing for resources • - What do you think? Develop your own hypothesis
Experimental Design • Materials (click here for further details) • Procedures (click here for further details) • Controls & Variables(click here for further details) • Safety Precautions-(follow safety instructions given by the teacher.)
Materials • - 3 culture dishes (made with jello and slimfast) • - Bacteria source (soil or your own hands) • - Antibacterial soaps ( Select two different soaps I used white soap from the girls bathroom and pink soap from the guys bathroom) • - rubber bands • - Q-tips • - labels • - Labels • - plastic wrap
Make three culture dishes by following the directions on the jello package(you could also use gelatine packages) substitute the juice for chocolate slimfast place bacteria in three different culture dishes. Bacteria can come from the soil or from your hands. If you use soil use the Q-tip to transfer the soil into the culture dish. 3. Label one of the dishes the control. Place plastic wrap over it and use a rubber band to hold it in place. Set this aside. 4.Put the two different soaps in the remaining two culture dish (one soap in each dish). Procedures
CONTROL: Culture dish – All of the bacteria were exposed to the same growth medium. Source of bacteria – Each dish is filled with soil from the same plant.(If you use your hands as the source of bacteria it should only be touched by one person) Temperature VARIABLE(S): The two soaps used in the two variable dishes should be different brands.(Example I use dthe soap from the men’s bathroom(white) and the soap from the womens room) Controls & Variables
Conclusions-Graph 1 Surface Area Population Growth • My hypothesis was correct. The soap from the women’s soap was more effective in killing bacteria. • The women’s soap was more effective in killing bacteria. • Bacteria started to grow on day two of the experiment. • The bacteria developed a resistance and then started to grow. Or maybe there wasn’t enough soap or soil (bacteria) • I think that the bacteria developed a resistance to the men’s soap after about two days. The men’s cup almost looked like the control.You could put more soap on it and see if the bacteria would die • Natural selection is when nature determines what survives. Only some bacteria develop a resistance. • After your results are done you can see what bacteria became resistant. • Evolution is the theory that all things change over long periods of time.
Conclusions- Graph 2 of species • One to three species were observed in the dishes. • Bacteria are asexual which helps the reproduce quicker. • Sexual produces more genetic variations. • ? HELP ?
Repeated Trials • View similar experiments by returning back to our student showcase link on our home page and explore other web-folio’s
1-The Process of Evolution 2-Unity & Diversity: A System for Classification 3-Bacteria & Natural Selection 4-Ecological Significance of Bacteria 5-Customizing Bacteria -Genetic Engineering 6-Bacteria in Animal Nutrition & Digestion 7-Using Bacteria for Environmental Problems Related Topics on Bacteria
Examples of Natural Selection • - • -
Key Ideas of Natural Selection • - • - • - • - • -