All of the following contributes to pathogenicity EXCEPT:
a. enzymes
b. capsules
c. toxins
d. allergic reactions
Answer: d. allergic reactions
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Several friends returned from a backpacking trip in a nearby state forest area and began to experience bouts of abdominal cramping, flatulence, and severe diarrhea with greasy, fatty stools. What is the most likely cause?
A. Cryptosporidiosis B. Giardiasis C. Toxoplasmosis D. Amebic dysentery
Which of the following cell features is absent
in a bacterial cell?
a. plasma membrane. b. cytoplasm. c. nucleoid. d. nucleus. e. DNA
If the frequency of a recessive gene in a population
under genetic equilibrium is 40 percent, in the next generation the frequency of that gene would be a. 20 percent. b. 40 percent. c. 80 percent. d. 2pq. e. unpredictable.
Porifera differ from other animals in that they
A. do not form true organs B. are sessile C. have three germ layers D. have radial symmetry