The primary consumers in natural communities
are
a. herbivores.
b. carnivores.
c. scavengers.
d. decomposers.
e. all of these
A
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Acquired immune tolerance is the body's ability to produce T cells and antibodies against antigens such as microbial antigens, while "tolerating" ________.
Fill in the blank(s) with the appropriate word(s).
The specialized reproductive structures of sac fungi are called
A) mycelia. B) asci. C) toadstools. D) basidia. E) zygospores.
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.
What is a potential problem with the use of transgenic varieties of plants that contain Bt toxin?
A) Bt toxin may be harmful to humans. B) Bt toxin may be harmful to some beneficial insects. C) Transgenic crop varieties with Bt toxin are not very hardy and require a lot of care. D) Transgenic crop varieties with Bt toxin require large amounts of chemical insecticides to grow.