A microbe that doesn't cause disease or is not a risk to the environment can be handled at which biosafety level?

A. Enzymes are made of protein: Enzymes are primarily composed of protein molecules that fold into specific three-dimensional shapes, enabling them to catalyze biochemical reactions efficiently.

B. Enzymes can be denatured: Enzymes can lose their functional shape, or become denatured, when exposed to extreme temperatures, pH levels, or chemical agents, which impairs their catalytic activity.

C. Enzymes can only work one time: Enzymes are not used up in reactions; they can catalyze the same type of reaction repeatedly without being consumed.

D. Enzymes can be found in biological organisms: Enzymes are naturally present in all living organisms, where they facilitate essential metabolic and physiological processes.

A. Escherichia: This bacterial genus includes Escherichia coli, a common cause of urinary tract infections and gastrointestinal illness, but it does not cause pinworm disease.

B. Enterococcus: These bacteria are part of the normal gut flora and may cause opportunistic infections, but they are not responsible for pinworm infestation.

C. Enterobius: Enterobius vermicularis is the causative agent of pinworm infection, a helminthic disease spread via the fecal–oral route and characterized by perianal itching, especially at night.

D. Entamoeba: Entamoeba histolytica is a protozoan parasite that causes amoebiasis and dysentery, but it is unrelated to pinworm disease.