In an egg, the ____ pole typically gives rise to surface structures and the anterior end of the embryo while the ____
pole gives rise to internal structures such as the gut and the posterior end of the embryo.
a. cleavage; gastrulation
b. gastrulation; animal
c. animal; vegetal
d. cleavage; embryonic
e. vegetal; animal
ANSWER: c
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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.
Which of the following is an HIV enzyme
essential for its successful replication in a host cell?
a. reverse transcriptase b. RNA polymerase c. DNA polymerase d. protease e. ligase
When sodium chloride is dissolved in water, it dissociates to form ______ ______ and ______ ______.
Fill in the blank(s) with the appropriate word(s).
A parasitic tapeworm living inside the intestines of a plant-eating porcupine would be at what trophic level?
A) producer B) primary consumer C) secondary consumer D) decomposer