Various strains of E. coli
A) may cause disease.
B) may be harmless.
C) are all exactly the same.
D) are all very different from one another.
E) may cause disease AND may be harmless.

Question

Quizplus · Accepted Answer

Various strains of E. coli can have different genes and produce different proteins, leading to a variety of effects on human health. Some strains can cause severe illness while others are benign or even beneficial to humans. Therefore, both A) and B) are true, making E) the best choice.

Various Strains of E. Coli