The development of antiviral drug therapy is difficult because
A. viruses are obligate intracellular parasites so the host cell can be harmed by the drug.
B. viruses do not have specific replication cycles that can be targeted.
C. viruses do not contain genetic material.
D. their life cycles do not have distinctive stages.
Answer: A. viruses are obligate intracellular parasites so the host cell can be harmed by the drug.
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Fill in the blank(s) with correct word
During fetal development, when is it possible to clearly hear the fetal heartbeat when the physician applies a stethoscope to the mother's abdomen?
Sexual reproduction involves which of the following processes?
a. splitting b. budding c. fertilization d. fragmentation e. parthenogenesis
Nitrogen is a __________ in plants.
Fill in the blank(s) with the appropriate word(s).