Why is it that the tongue and cheek epithelium doesn't provide a sufficient anaerobic environment for plaque anaerobes to grow, but the surface of teeth might?
A. The epithelium is supplied with oxygen by capillary beds. This makes it a relatively aerobic environment and hostile to anaerobes.
B. The tooth enamel is supplied with oxygen by capillary beds. This makes it a relatively anaerobic environment and hostile to aerobes.
C. The surface of the tongue and cheek are constantly scraped by the action of consuming food. Layers of bacterial growth that might help to supply an anaerobic environment are scraped away, exposing lower levels to oxygen-rich air.
D. The surface of teeth (especially the molars) have many pits and crevices that can serve as 'pockets' for layers of bacteria to grow in. Once the layers get deep enough, the bottom portions are anaerobic. This isn't possible on the very smooth surface of the tongue and cheek epithelium.
A.
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A. ecological isolation. B. hybrid infertility. C. gametic isolation. D. hybrid inviability. E. temporal isolation.
Four of the five processes listed below are related by
a common result. Select the exception. a. volcanic eruption b. photosynthesis c. respiration d. combustion e. decomposition
Provide a brief definition for positive interference
What will be an ideal response?
Which of the following occurs during mitosis but not during meiosis 1?
A. The chromosomes are pulled to opposite poles of the spindle apparatus B. The chromatids of each chromosome are separated C. The nuclear envelope breaks down D. Both synapsis and crossing over take place E. The diploid number of chromosomes is reduced to the haploid number