Metastatic tumors:a
are examples of neoplasms.
b. contain cells tightly controlled by the cell cycle.
c. contain nondividing cells.
d. are caused by the normal expression of homeotic genes.
e. are localized in one part of the body.
a
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Which type of plant hormone has been shown to both promote pollen tube elongation and inhibit root
elongation?
a. jasmonates b. ethylene c. brassinosteroids d. salicylic acid e. oligosaccharins
A male fish has changed into a female fish. What kind of hermaphroditism occurred?
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In a regulatory cascade, control at termination requires that
a. one early gene encodes a sigma factor that activates late genes. b. expression of host genes must be inactivated. c. all expressed genes be transcribed as a single polycistronic unit. d. early genes must be switched off before middle or late genes can be expressed. e. the transcription units be adjacent to each other.