Biosynthesis of vitamin K (menaquinone) by ________ spp. inhabiting the ________ of humans is a potentially important mutualistic relationship for human health.
A) Bifidobacterium / intestinal tract
B) Bifidobacterium / stomach
C) Escherichia / intestinal tract
D) Escherichia / stomach

Question

Quizplus · Accepted Answer

Escherichia coli, a species of bacteria that inhabits the intestinal tract of humans, is known to synthesize vitamin K (menaquinone), which is an important factor for human health, particularly in blood clotting and bone metabolism. This represents a mutualistic relationship where humans provide a habitat and nutrients for the bacteria, and in return, the bacteria produce a vital nutrient.

Biosynthesis of Vitamin K (Menaquinone) by ________ Spp