The Biofilm That Forms in Your Shower ("Shower Curtain Scum")

question 22

Multiple Choice

The biofilm that forms in your shower ("shower curtain scum") can tolerate exposure to hot water when you shower and is resistant to desiccation between showers.The microbes in the biofilm are not endospores, so what is the best explanation for their survival under these conditions?

• A)Bioflms are composed of diverse microbes, and within each biofilm, there are certain to be endospore-formers and thermophiles.
• B)The shower hasn't been thoroughly cleaned in a while, and when I really scrub it, the microbes will all be killed.
• C)Although some microbes will be killed, those embedded deeply within the biofilm are protected from environmental challenges.
• D)Dead skin cells continuously replenish the biofilm, and organic soaps provide a continuous carbon source.

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Definitions:

Ions

Atoms or molecules with a net electrical charge due to the loss or gain of one or more electrons.

Gases

Substances that can expand freely to fill any space available, irrespective of its quantity.

Subatomic Particles

Particles smaller than atoms, including protons, neutrons, and electrons, which make up the atom's structure.

Electrons

Negatively charged particles present in every atom that function as the main conduits for electrical current in solid materials.