A(n) ____ is a type of chemical bond in which a strong mutual attraction forms between ions of opposite charge
a. hydrogen bond
b. nonpolar bond
c. polar bond
d. covalent bond
e. ionic bond
ANSWER: e
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Attenuated agents
A. may induce immunity after a single dose. B. may cause disease in immunocompromised individuals. C. multiply in the body. D. may revert or mutate to disease-causing strains. E. All of the choices are correct.
Birds are different from all other living vertebrates because they
A. can fly. B. lack teeth. C. have feathers. D. are bipedal.
What is the most likely reason that bats, raccoons, and foxes readily become infected with the rabies virus, whereas opossums are resistant to infection?
A. The rabies virus is unable to replicate once it has entered the opossum cells. B. Infected opossums do not shed rabies virus in their saliva. C. Opossums rarely contact other infected animals. D. Opossums lack the appropriate receptor for the rabies virus.
Four of the five answers listed below are protistan structures. Select the exception
a. cell membrane b. pili c. mitochondrion d. eyespot e. pellicle