Hydrogen sulfide is highly toxic because it
a. forms sulfuric acid.
b. denatures proteins.
c. binds the iron in heme.
d. binds the iron in cytochromes.
Answer: D
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The drug of choice for the treatment of granuloma inguinale, which is a major cause of genital ulcers in India, New Guinea, and part of South America, is:
a. clindamycin. b. doxycycline. c. imipenem. d. gentamycin.
Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have
A. swim bladders and gill covers called opercula. B. swim bladders and a complete digestive system. C. swim bladders and a closed circulatory system. D. swim bladders and movable jaws.
In humans, hair texture is an incompletly
dominant trait. Curly hair is the homozygous dominant trait; smooth hair is homozgous recessive; wavy hair is heterozygous. If two wavy haired individuals have children what is the expected phenotype ratio?
a. 1:2:1 b. 3:1 c. 4:0 d. 1:1 e. 1:0
Ferns, roots, and fronds grow from __________. Fill in the blank(s) with the appropriate word(s)