Which statement best describes the effect nicotine has on the central nervous system? a. it acts as a stimulant and causes pleasurable feelings. b. it acts as a sedative and relaxes the mind. c. it acts as both a stimulant and a sedative.

Which of the following statements describes the lysogenic cycle of lambda (λ) phage? a) after infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then lyses.b) most of the prophage genes are activated by the product of a particular prophage gene.c) the phage genome replicates along with the host genome.d) the phage dna is copied and exits the cell as a phage.