Concerning diatoms' potential use as drug-delivery systems, which anatomical feature would seem to be most important?
a. their ability to withstand immense pressure
b. the chemical composition of their cell walls
c. the porous nature of their cell walls
d. the chemical composition of their food-storage material
e. the nuclear envelope
Ans: c. the porous nature of their cell walls
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Prokaryotes ____
a. have a nucleus b. are multicellular c. always have cell walls d. are either bacteria or archaeans e. always have flagella
If fungi of the genus Cordyceps are ingested by insects, fruiting bodies from the fungi will form and erupt through the bodies of the insects and then kill the insect hosts. Since Cordyceps are using the insects as a host for growth and dispersal, these
fungi are an example of A) symbiosis. B) parasitic fungi. C) lichens. D) mycorrhizae.
A)_________ adjust focus by changing its thickness through contraction of Ciliary muscle, known as (B)_____________.
a. (A) lens, (B) accommodation b. (A) retina, (B) accommodation c. (A) lens, (B) adaptation d. (A) retina, (B) adaptation