A parasitic disease known as Schistosomiasis is caused by several species of flatworms in the
phylum Platyhelminthes. The life cycle includes an aquatic snail where the larvae develop;
these larvae then hatch into the water and swim around until they find the appropriate
vertebrate host. Adult males and females reproduce sexually in the vertebrate host, and eggs
are usually shed into water via feces or urine. The snail would be considered a(n)
__________.
a. intermediate host
b. vector
c. primary host
d. cyst
A
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During stationary phase, group members of Serratia produce prodigiosins that contain pyrrole
Considering its structural relatedness to other pyrrole-containing molecules of known function (e.g., chlorophylls, bacteriochlorophylls, porphyrins), propose a potential ecological role for these compounds in soil where they are involved in something other than photosynthesis. What will be an ideal response?
The major class(es) of neurotransmitter receptor(s) found in postsynaptic membranes are
A. metabotropic and neurotropic. B. ionotropic and gonadotropic. C. gonadotropic and neurotropic. D. neurotropic and isotopic. E. metabotropic and ionotropic.
Research on HIV vaccines is progressing, but success to date has been limited to vaccines that are of
limited effectiveness against a few strains of the HIV virus. However, flu vaccines are similar in their limitations. Why are ‘limited effectiveness’ flu vaccines released, but not HIV vaccines? What will be an ideal response?
If a parent cell divides through 8 generations, how many cells will result?
A. 8 B. 64 C. 128 D. 256 E. 100,000,000