Consider the phylogeny (Fig. 34.15) below. The group Dikarya has more species than all other taxa on the tree combined
Using only the information conveyed by the labeled
phylogeny below, indicate which one of the following statements is a plausible explanation
why this is so.
A. The amount of available habitat is greater
for members of the Dikarya.
B. There hasn't been enough research done
on the Chytrids, so there may be many more
undescribed species.
C. The evolution of hyphae allowed for rapid
speciation of four of the five major groups of
fungi.
D. The Dikaryotic condition provides more
genetic variation and opportunities for
evolution of new species.
D
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Gram-negative broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
The structures labeled "5" are
a. trichocysts. b. micronuclei. c. flagella. d. pili. e. gullet.
The cells capable of releasing histamines are ____
a. mast cells and basophils b. basophils and eosinophils c. mast cells and eosinophils d. natural killer cells and macrophages e. B and T cells
Ascospores in yeast are not arranged in a particular order. Thus, the four haploid ascospores contained within a yeast ascus are known as what?
What will be an ideal response?