The negative stain is used to
A) visualize endospores.
B) determine Gram reaction.
C) determine flagella arrangement.
D) visualize capsules.
E) determine cell size.
E
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If N2 gas comprises 79 percent of atmospheric air at sea level, what is PN2?
a. about 300 mm Hg b. about 400 mm Hg c. about 500 mm Hg d. about 600 mm Hg e. about 700 mm Hg
____________________ result from immunological hypersensitivity to what should be harmless substances. Fill in the blank(s) with the appropriate word(s)
When you break your leg, a thickened area forms around the outside of the bone. Over a period of time, this thickened area
A) moves to the skin surface and is shed as dead skin. B) becomes a permanent part of the spongy bone. C) is dissolved by osteoclasts as osteoblasts add new bone. D) is digested by enzymes secreted by the muscles. E) forms new tendons, ligaments, and/or muscles.
Lichens are adversely affected by
A. sunlight. B. humidity. C. sexual reproduction of the fungal partner. D. asexual reproduction of the photosynthetic partner. E. pollution.