The intermediate host of the Platyhelminthes is freshwater:
a. fish.
b. snails.
c. crabs.
d. crayfish.
B
The intestinal trematodes (flukes) are members of the phylum, Platyhelminthes (flatworms); they are dorsoventrally flattened and require at least one intermediate host (a freshwater snail).
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What term describes the conversion of glucose into two pyruvates?
a. Kreb's cycle b. Photosynthesis c. Glycolysis d. Anaerobic respiration e. Aerobic respiration
Restriction enzymes cut double-stranded DNA
a. between genes. b. at specific base sequences c. between bacterial and viral DNAs. d. between purines and pyrimidines. e. between promoter and operator DNA sequences.
The fungus Pneumocystis jiroveci is found in the lungs of most people in low numbers, but in immunocompromised people it overgrows, resulting in severe respiratory problems. The fungus is best described as
A) a parasite. B) resident microbiota. C) a mutualist symbiotic partner. D) transient microbiota. E) both resident microbiota and opportunistic pathogen.
John has been diagnosed with gonorrhea and he is worried about his ex-girlfriend, with whom he had been having sex. But she hasn't said anything about it to him, so he just decides to not say anything. Please choose the statement that best explains why his girlfriend does not have symptoms.
A) The rate of symptoms, particularly in women, can be very low. B) N. gonorrhoeae becomes dormant in the body, without symptoms for years, so she won't know that she has it for a long time. C) She had been taking an antibiotic ointment for her acne, and this must have protected her also from gonorrhea. D) It is very difficult to transmit gonorrhea, so he is correct in figuring that she never got it.