All of the following are correct about treating viral diseases except
A. viruses are killed by the same antibiotics that kill bacteria.
B. many antiviral drugs cause severe side effects.
C. interferons show potential for treating and preventing viral infections.
D. many antiviral drugs block viral replication.
E. All of these choices are correct.
Answer: A
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A marine fish's kidney plays little role in nitrogenous-waste removal
Indicate whether the statement is true or false.
The figure illustrates
a. repression of the lactose operon. b. promotion of the lactose operon. c. formation of a repressor molecule. d. attachment of lactose to DNA. e. all of these.
A nerve impulse moves along a neuron as:
a. sodium moves into the cell and potassium moves out of the cell. b. sodium binds to potassium. c. sodium and potassium are pulled apart. d. acetylcholine moves along the nerve fiber. e. calcium exits the dendrites.
Which is a basic difference between gymnosperms and flowering plants?
a. Gymnosperms produce “naked” ovules, while flowering plants produce “naked” seeds. b. Gymnosperms produce only cones, while flowering plants produce both flowers and cones. c. Gymnosperms produce seeds that are enclosed within a fruit, while flowering plants produce seeds borne naked. d. Gymnosperms produce seeds borne naked, while flowering plants produce seeds enclosed within a fruit. e. Gymnosperms produce flowers that have floral parts arranged in threes, or multiples of threes, while flowering plants have floral parts arranged in fours or in multiples of four.