Why is ribosomal RNA so useful for cataloging species in microbiome research?
A. The genes for rRNA are universal and slow to evolve.
B. The genes for rRNA are more stable than other DNA, even in seawater.
C. Genes for rRNA are unique to microbes, and not found in higher organisms.
D. The few species that have rRNA genes are easily characterized by their presence.
Answer: A
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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
The study of DNA sequences indicates that the evolution of new functions for proteins typically occurs ________.
a. after gene duplication b. after genetic drift c. before gene duplication d. during gene flow
Sarcolemma is what?
What will be an ideal response?
Based on the information in Table 23-1, one characteristic used at the class level of classification for
corn is: a. flower parts in fours or fives. b. separate male and female flowers. c. the presence of a single seed leaf. d. flowering vascular plants. e. tall annual grasses.