The abundant presence of ammonite fossils in a large area indicates that the area was once part of an ocean.
a. true
b. false
Answer: a. true
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The infectious form of Chlamydia trachomatis is a(n)
A. reticulate body. B. elementary body. C. primary element. D. core body.
The sac fungi are characterized by sexual reproductive structures called:a
asci. b. basidia. c. conidia. d. gemmae. e. conidiophores
A pharmaceutical company hires a chemist to analyze the purity of the water being used in its drug preparations. If the water is pure, the chemist would expect to find
A) only molecules of H2O. B) only H2O molecules and H+ ions. C) H2O molecules, H+ ions, and OH- ions. D) only H+ ions and OH- ions.
The bacteria Pseudomonas aeruginosa produces a protein that is secreted into its environment. The protein inhibits synthesis of elongation factor 2 (another protein) in humans. This effect may sound dangerous, but it has been considered as a possible
treatment for hepatitis B. The protein produced by P. aeruginosa is a(n) A) endotoxin. B) exotoxin. C) biological weapon. D) biofilm.