Because they are Gram negative, E. coli, Salmonella, and Shigella all produce
a. exotoxins.
b. cytolytic toxins.
c. endotoxins.
d. enterotoxins.
Answer: C
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Obligately anaerobic normal flora are found in ________, which is an/are anoxic habitat(s) of the body
A) the kidneys B) the skin C) portions of the oral cavity D) the lungs
During the process of eukaryotic mRNA degradation, all of the following occur except:
A. The poly(A) tail is lengthened. B. The 5' cap is removed. C. The exosome degrades the molecule to component nucleotides. D. Localization to processing bodies occurs.
According to the optimal foraging theory, a predator will select prey 1 (P1 ) over prey 2 (P2 ) when
A) E1 < E2. B) Th1 < Th2. C) E1/Th1 < E2/Th2. D) Nprey1 > N prey2.
Which organism is NOT correctly matched to its energy source?
A) photoheterotroph - light B) photoautotroph - CO2 C) chemoautotroph - Fe2+ D) chemoheterotroph - glucose E) chemoautotroph-NH3