Acyclovir is used to treat infections caused by ________.
A. hepatitis C virus
B. influenza A virus
C. HIV
D. herpes simplex virus
E. respiratory syncytial virus
Answer: D
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Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain dies and becomes nonlethal. Type R Streptococcus pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The S strain would be transformed into the nonvirulent R strain and kill the host. B. The R strain would be transformed into the virulent S strain and kill the host. C. The S strain would be transformed into the nonvirulent R strain and not affect the host. D. The R strain would be transformed into the virulent S strain and not affect the host. E. Neither the S nor the R strain would change.
The number of protons in an atomic nucleus can also be described as the __________ of an atom.
a. atomic mass b. mass number c. isotope number d. atomic number
Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?
A. Sympathetic activation has no effect on blood flow. B. Leakage of fluids from the capillaries has no effect on blood flow. C. Blood hematocrit has no effect on blood flow. D. Blood vessel length is relatively fixed and has no effect on blood flow.
What adaptations did ancient algae have to make as they washed ashore and evolved into land plants?
What will be an ideal response?