A sample from a patient is prepared using the Gomori methenamine silver stain. What type of microbe is suspected of being present?
A) bacteria
B) parasitic worm larva
C) fungus
D) protozoal parasite
E) virus
C
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During the Jurassic Period, several different mammalian lineages independently evolved an herbivorous lifestyle for obtaining energy. This has resulted in
A) different digestive patterns in herbivorous animals, some that depend on gut microbiota to digest plant material and some that do not. B) different digestive patterns in herbivorous animals that all depend on gut microbiota to digest plant material. C) the evolution of foregut fermentation, as seen in ruminants, as the only digestive pattern that depends on fermentative gut microbiota. D) horizontal gene transfer of genes for glycoside hydrolases and polysaccharide lyases from bacteria to mammals.
Blood vessels that will enter the umbilical cord come from the ____
a. yolk sac b. amnion c. chorion d. allantois
e. chorionic villiDuring DNA replication in E. coli, how does the cell prevent the DNA strands from following their natural tendency to seek maximum stability and reanneal?
What will be an ideal response?
The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the LEAST convincing?
A. Fewer predators in the tropics allow more prey species to flourish. B. Niches are narrower in the tropics. C. The tropics have greater plant production, which supports greater overall species richness. D. Seasonal variability is less in the tropics. E. Greater spatial heterogeneity in the tropics creates more niches.