You are examining a bacterial smear on a light microscope. You observe pinkish-red bacilli and blue cells of various shapes. You are probably looking at a smear prepared with the ________ stain
A) Gram
B) Ziehl-Neelsen acid-fast
C) Schaffer-Fulton endospore
D) Gomori methenamine
E) Hematoxylin and eosin
B
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Alkaloids are considered "expensive" defense compounds to produce because:
A. they contain a lot of carbon, which is costly for plants to concentrate. B. they vaporize readily, so they constantly have to be synthesized. C. they contain nitrogen, an essential and often limiting element plants need. D. they often function in very small concentrations. E. they contain proteins, which are very costly for a plant to produce.
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.
Oxygen acts as a final electron acceptor in respiration and is ultimately converted into which
molecule?
a. water b. ATP c. CO2 d. glucose e. phosphate
Describe how a penis becomes erect during sexual intercourse
What will be an ideal response?