試題詳解

18. Which of the following is true of viruses in the extracellular phase?
(A) They possess many different enzymes.
(B) They can reproduce independently of living cells but only at a slow rate.
(C) They possess 12 different enzymes.
(D) They possess many different enzymes and they can reproduce independently of living cells but only at a slow rate.
(E) They behave as a macromolecular complex and are no more alive than are ribosomes.