During forced inhalation, the ____ intercostal muscles contract, moving ____ upward
a. internal; the diaphragm
b. internal; the ribs
c. external; the diaphragm
d. external; the ribs
e. external; both the diaphragm and the ribs
d
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The molecule shown above is the purine ____
a. thymine b. adenine c. uracil d. guanine e. cytosine
Because of the complexity of the Schistosoma life cycle, there are several parts of the cycle that could be disrupted to halt the spread of the disease. Which of the following proposals is not likely to succeed in decreasing the prevalence of schistosomiasis?
A. Install sanitary sewage treatment facilities to prevent the dispersal of eggs present in urine and feces. B. Apply chemical molluscicides (chemicals targeted to molluscs like snails) to bodies of fresh water. C. Identify a surface protein on Schistosoma miracidia that the immune system can recognize and create a vaccine using that antigen. D. Monitor water bodies to detect the presence of infectious miracidia and enforce no bathing rules when they are present.
What is complement? How does it work?
What will be an ideal response?
Approximately ____ Y-linked genes have been discovered
a. 10 b. 20 c. 60 d. 80