With regards to mode of disease transmission, respiratory pathogens are generally ________, and intestinal pathogens are generally spread by contaminated ________
A) spread by direct contact / vectors
B) spread by indirect contact / carriers
C) more transmissible / needles
D) airborne / food or water
Answer: D
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An increase in the extracellular concentration of salts will cause body cells to
A. lose water and shrink. B. lose water and swell. C. gain water and shrink. D. gain water and swell. E. metabolize water and heat up.
The current status of gene therapy is:
a. it is currently being used effectively to cure cystic fibrosis. b. it has been terminated because clinical trials have shown that it is ineffective. c. it is being evaluated to assess the risks associated with potential side effects. d. the number of clinical trials is increasing at an almost uncontrolled rate. e. that it may be considered in the future, but currently the technology is not available.
Endangered species
A. are mainly found in the tropics. B. are likely to be in danger of extinction in the future. C. will become extinct in the next 50 years. D. are in danger of extinction throughout all or most of their range. E. are those species found only in zoos, aquaria, and museums.
Which of the following is an example of a protein that is inhibited when bound to its regulatory subunit(s) but becomes active when free?
a. Adenylyl cyclase b. cAMP-dependent protein kinase c. Protein kinase C d. Phosphorylase kinase