ALL of these respiratory pathogens require person-to-person propagation EXCEPT
a. Legionella pneumophila.
b. Streptococcus spp.
c. influenza virus.
d. both Streptococcus spp. and influenza virus.
Answer: A
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An antiviral that is a guanine analog would have an antiviral mode of action that
A. blocks transcription and translation. B. blocks penetration. C. blocks maturation. D. inhibits DNA synthesis. E. bonds to ergosterol in the cell membrane.
The only known source of human embryonic stem cells is:
a. placental tissue. b. umbilical cords. c. early human embryos. d. brain tissue. e. nerve tissue.
The statement that energy is never created or destroyed is known as
A. thermodynamics. B. kinetic molecular theory. C. first law of matter and energy. D. law of conservation of energy.
Procollagen chains are synthesized on the endoplasmic reticulum.
a. true b. false