Raw red alga of the genus Porphyra is part of a traditionalJapanese diet. This alga is rich in porphyran, a polysaccharide that human digestive enzymes cannot break down. Marine bacteria that live on the alga produce a porphyran-digesting enzyme. In Japan, a homologousenzyme is common in one species of intestinal bacteria. Outside of Japan, people have the same species of intestinal bacteria, but they do not have the gene for the porphyran-digesting enzyme. The marine bacteria andthe intestinal bacteria are not close relatives, so they mostlikely did not inherit the enzyme from a shared ancestor.Propose a scenario to explain the observed distributionof the enzyme.
Raw red alga of the genus Porphyra is part of a traditionalJapanese diet. This alga is rich in porphyran, a polysaccharide that human digestive enzymes cannot break down. Marine bacteria that live on the alga produce a porphyran-digesting enzyme. In Japan, a homologousenzyme is common in one species of intestinal bacteria. Outside of Japan, people have the same species of intestinal bacteria, but they do not have the gene for the porphyran-digesting enzyme. The marine bacteria andthe intestinal bacteria are not close relatives, so they mostlikely did not inherit the enzyme from a shared ancestor.Propose a scenario to explain the observed distributionof the enzyme.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Raw red alga of the genus Porphyra is part of a traditional
Japanese diet. This alga is rich in porphyran, a polysaccharide that human digestive enzymes cannot break down. Marine bacteria that live on the alga produce a porphyran-digesting enzyme. In Japan, a homologous
enzyme is common in one species of intestinal bacteria. Outside of Japan, people have the same species of intestinal bacteria, but they do not have the gene for the porphyran-digesting enzyme. The marine bacteria and
the intestinal bacteria are not close relatives, so they most
likely did not inherit the enzyme from a shared ancestor.
Propose a scenario to explain the observed distribution
of the enzyme.
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