A major factor in the re-emergence of vaccine-preventable diseases in the early 21st century has been
A) a flawed research study incorrectly linking vaccination to autism was published in the late 1990s.
B) microbes can develop resistance to vaccines just as they to do antibiotics.
C) fears of biological weapons after the September 11, 2001 terrorist attacks turned public sentiment against vaccines.
D) a flawed research study incorrectly linking vaccination to breast cancer was published in the late 1990s.
E) concerns about animal rights have led people to avoid pharmaceuticals and other products that might have been tested on animals.
Answer: A
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Meningitis can be caused by
A) viral infections. B) bacterial infection. C) fungal infections. D) viral, bacterial, or fungal infections.
Spider crabs are an osmoconforming species, which likely means:
A. they have the same temperature as their environment. B. they regulate their temperature within their environment. C. they have the same solute concentration as their environment. D. they regulate their solute concentration within their environment.
Where would you expect to find proteins responsible for controlling the substances that enter and leave
mitochondria?
a. plasma membrane of the cell b. inner mitochondrial membrane c. outer mitochondrial membrane d. nuclear membrane e. lysosomal membrane
Natural killer cells are capable of ____
a. stimulating T cell memory b. killing bacteria in the interstitial fluid c. destroying body cells lacking MHC markers d. shutting down adaptive immune responses e. destroying parasites in the bloodstream