Which mouthwash will kill germs better? Listerine or Scope? Honors Bio. Chem. Period 2

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Laureece Robinson

Which mouthwash will kill germs better? Listerine or Scope?

Honors Bio. Chem. Period 2.

Overview page

My hypothesis is that Listerine will kill germs because of the amount of alcohol in it. I also think Listerine will kill more germs because it’s more known and it’s very popular. My organism is streptococcus. My independent variable is the mouthwash. My dependent variable is the germs.


My organism is Streptococcus. Streptococcus is a bacterium of a genus that includes the agents of souring milk and dental decay, and hemolytic pathogens causing various infections such as scarlet fever and pneumonia. My organism is a gram-positive, nonmotile, non spore forming coccus that occurs in chains or in pairs of cells. Streptococcus has three main groups (A, B, and D). Streptococcus causes impetigo, middle ear infections, scarlet fever, rheumatic fever, and a rare case of toxic shock syndrome.


Kingdom- Bacteria

Phylum- Firmicutes

Class- Bacilli

Order- Lactobacillales

Family- Streptococcaeceae

Genus- Streptococcus (Rosenbach, 1884)

Cell type, organization, and body plan

Streptococcus is unicellular. This organism has prokaryote cells. Streptococcus doesn’t have any tissues but if it gets into to your tissues it could harm them. Streptococcus doesn’t have a organ system either.

Types of metabolism

My organism is respiration. It is both aerobic and fermentation respiration. Respiration in streptococcus is activated by environmental haem.


My organism is asexual. Streptococcus’s reproduction works by spreading from one person to another. Streptococcus can reproduce many times. As long as it keeps getting spread it will keep reproducing.

Evolutionary Information



Streptococcus is on the bottom of the food chain. My organism doesn’t eat anything, but it is eaten by man animals and insects. It sits in the stomach and helps break down food so that it can be digested. Streptococcus can eat away at your skin or your throat if you get a streptococcal infection. Streptococcus belongs to trophic level five. Streptococcus has a symbiotic relationship with staphylococcus.


Streptococcus is found in the throat (http://www.innerbody.com/image/dige01.html) and on the skin (http://www.webmd.com/skin-problems-and-treatments/picture-of-the-skin) .

Independent Variable

My independent variable is mouthwash. Mouthwash is a liquid that you gargle to refresh your breath and it kills germs. Research shows that mouthwash kills 99% of germs in your mouth and it prevents plaque, cavities, gingivitis, and bad breath. “The first known references to mouth rinsing are in Ayurveda and Chinese medicine, about 2700 BC, for treatment of gingivitis. [Citation needed] Later, in the Greek and Roman periods, mouth rinsing following mechanical cleansing became common among the upper classes, and Hippocrates recommended a mixture of salt, alum, and vinegar.[5] The Jewish Talmud, dating back about 1800 years, suggests a cure for gum ailments containing "dough water" and olive oil.”- http://en.wikipedia.org/wiki/Mouthwash

Dependent Variable

My dependent variable is mouth germs. Mouth germs are germs that you get in your mouth from not keeping up with your oral hygiene. My dependent variable and my organism relates because streptococcus is a bacteria that you can get in your mouth from germs. I will need a microscope to measure my dependent variable and it is measured in micrometers (µm).

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