In Paine’s study, the starfish are the top predators in this system and eat each of the other
species mentioned. Whelks eat both mussels and barnacles, while both mussels and barnacles
are filter feeders that feed on small particles in the water, including algae and other
autotrophs. In terms of the number of organisms, you would expect __________ to have the
highest number of individuals
a. mussels
b. whelks
c. starfish
d. both whelks and starfish
A
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Viruses are isolated from wild-type E. coli cells that have been infected with wild-type bacteriophage ?. These viruses are used to infect a Gal? strain of E. coli. A few bacterial colonies that can grow on galactose are obtained, while no bacteria that can grow on galactose are obtained from cells that were not infected. What has happened?
A) A ? gal+ phage was generated. B) Reversion mutations have occurred. C) The bacteria underwent conjugation with a Gal+ strain. D) The bacteria underwent transformation with a wild-type E. coli strain.
In most eumetazoans the innermost tissue layer during development is the
a. mesoderm. b. epiderm. c. mesoglea. d. endoderm. e. ectoderm.
What is the effect of a beta-barrel on the permeability of a membrane?
a. It decreases permeability. b. It increases permeability. c. It has no effect. d. beta-barrels are never found in membranes.
Elephantiasis is caused by
A. blood flukes. B. liver flukes. C. filarial roundworms. D. tapeworms. E. flatworms.