When a characteristic is shared by species that do not share a common ancestor this is caused by which of the following?
a. the evolution of homologous characteristics
b. the evolution of vestigial characteristics
c. the change in allele frequency in the gene pool of the species
d. the convergence of form of organisms that share similar environments
d. the convergence of form of organisms that share similar environments
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Chemical signals that cause long term responses in the receiver are most specifically called:
a. hormones b. signal pheromones c. priming pheromones d. communication signals e. acoustical signals
Embryonic stem cells are pluripotent. What
does this mean?
a. they can divide an unlimited amount of times b. they can give rise to most, but not all body cell types c. they can give rise to any of the body cell types d. they are indestructible e. they can give rise to different, unique individuals
This arthropod is the vector for Lyme disease
a. spider b. tick c. wasp d. mosquito e. mites
With the disk diffusion method, the larger the zone of inhibition, the more effective the antibiotic is.
a. true b. false