Activated thrombin makes this protein change
A) fibrinogen
B) agglutinate
C) plasmin
D) prothrombin
A
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The generation time of Escherichia coli in the human intestine is ________ in laboratory culture
A) at about the same rate as B) faster than C) more optimal than D) slower than
Which of these is considered a potentially dangerous heavy metal contaminant in soil?
A. cadmium B. iron C. copper D. molybdenum E. zinc
How does tryptophan, the end product of the trp operon, function in the regulation of the operon?
A) Trp binds to and inhibits the repressor, thus allowing transcription of the operon. B) Trp binds to and activates the repressor, which then binds to DNA to allow transcription of the operon. C) Trp binds directly to DNA and inhibits transcription of the operon. D) Trp binds to and changes the conformation of the repressor, which can then bind DNA and block transcription of the operon.
What property describes the plasma membrane's ability to regulate movement of molecules into and out of the cell?
a. polarity b. integrity c. permeability d. solubility