An organism which is sensitive to an antibiotic is grown in the lab in a pure culture on a medium with the antibiotic , if we see colonies of the organism growing on the plate then it must have undergone

a. transpoon muagenesis
b. spontaneous mutation
c. natural selection
d. x ray induced mutation

the vp test is used to differentiate

a. gram positive organisms
b. gram negative organisms
c. klebsiella vs enterobacter
d. genus of enterobacteriaceae family

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.