The methanogens, producers of methane gas, require environments that
A. are directly exposed to sunlight.
B. have abundant oxygen and CO2.
C. are extremely cold.
D. are very acidic.
E. are anaerobic with hydrogen gas and CO2.
Answer: E
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The infectious stage of chlamydiae is called a(n) ________ body.
A. oogonial B. contagious C. elementary D. reticulate
Insertion sequences
A. are the simplest type of transposon. B. code for a transposase enzyme. C. are characterized by an inverted repeat. D. can produce pili. E. are the simplest type of transposon, code for a transposase enzyme, AND are characterized by an inverted repeat.
Though legless, the caecilian worm, Dermophis mexicanus is still classified with the amphibians. To which order do the caecilian worms belong?
a. Urodela b. Anura c. Apoda d. Salientia
Once infected with Trypanosoma brucei, the patient's immune system cannot clear the infection and develop immunity because the parasite
A. has flagella that allow it to travel all over the body. B. matures into infectious trypomastigotes. C. reproduces by binary fission. D. changes its glycoprotein surface antigens every time it replicates. E. invades the central nervous system.