In the life cycle of a bread mold, the stage in which diploid nuclei occur is:
A. the gametangium
B. the aseptate hypha
C. the asexual spores
D. the sporangium
E. the zygosporangium
E. the zygosporangium
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Atoms of a single element that possess different numbers of neutrons are called:
A. isomers. B. polymers. C. ions. D. isotopes. E. monomers.
The guidelines designed for prevention of nosocomial disease during care of all patients is called
A. Universal Disposables. B. Disinfection Manifesto. C. Asepsis Preference. D. Standard Precautions.
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.
A man comes to his physician complaining of drowsiness and a desire to sleep. He is suffering from tremors. He has just returned from central Africa. His physician believes that he may be suffering from a disease caused by Trypanosoma brucei, variety gambiense. If so, he has been bitten by a:
a. tsetse fly b. "kissing bug" c. mosquito d. tick