A chemical that is effective in preserving foods with a low pH such as bread is ________.
A. sodium propionate
B. sodium nitrate
C. sodium sulfite
D. sodium citrate
Answer: A
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Transmission of Aeromonas spp. to humans is by:
a. exposure of disrupted skin and mucosal surfaces to contaminated animal hides. b. ingestion of contaminated seafood or wa-ter. c. inhalation of contaminated air. d. close contact with carriers of the organism.
What is a global impact of glacier recession?
a. lower crop yields b. increased precipitation c. rising sea levels d. fewer tropical storms
Your friend wants to know why birds such as boobies and birds of paradise have elaborate mating rituals. You explain that:
1.Behavioral rituals are a way to keep a bird from breeding with the wrong species, since the rituals are specific to each species. 2.Birds are social and need a way to attract a mate. 3.Birds have evolved mating rituals as methods to display their elaborate and beautiful plumage. 4.Mating rituals have evolved to keep males from mating with more than one female.
Unlike most enveloped viruses, herpes viruses involve the host ________ membrane in the formation of their envelope.
A. nuclear B. plasma C. mitochondrial D. None of the choices are correct.