Embryonic stem cells have the ability to become any cell type of the body. This capacity is termed:
a. differentiation
b. multidirectional
c. undifferentiated
d. pluripotency
e. genetically undefined
d
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Phanerochaete chrysosporium:
A. is a wood-decay fungus that is used to bleach paper and decompose dioxin B. is a lichen that serves as food for reindeer C. is the cause of lung disease D. is an hallucinogenic mushroom E. is a rust that causes oak trees to shed their leaves prematurely
Describe the route of water through a sponge.
A. enters through pores into the spongocoel and exits via the osculum. B. enters through the osculum into the spongocoel and exits via pores. C. enters through the spongocoel into the osculum and exits via pores. D. enters through the pores into the osculum and exits via the spongocoel. E. enters through the osculum into the mesohyl and exits via the spongocoel.
According to Wallace's biogeographical realms, North America belongs primarily to the
a. Neotropical. b. Ethiopian. c. Palearctic. d. Nearctic. e. Oriental.
Competition typically
A) only involves two closely related species. B) involves a predator and prey. C) is a complex interaction of biotic and abiotic factors. D) is random.