Prokaryotes reproduce by ___________, which creates _____ exact daughter cell clone(s) of the original parent cell.
a. trinary fission; three
b. sexual fission; one
c. binary fission; two
Ans: c. binary fission; two
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Class I major histocompatibility complex molecules are found on ________ cells.
A. all anucleated B. all nucleated C. antigen-presenting D. None of the choices are correct.
Decontaminating and disinfecting surfaces may result in a decreased removal of contaminating organisms when used in combination. This is due to the fact that:
a. agents are all synergistic and should not be of concern in the laboratory. b. agents mixed together may actually inac-tivate each other or create harmful chem-icals resulting in additional hazards. c. agents are antagonistic and will not be as effective. d. agents are already premixed to maximize sterilization.
The correct sequence of events in viral multiplication is
A. uncoating, penetration, synthesis, assembly, absorption, and release. B. adsorption, penetration, uncoating, synthesis, assembly, and release. C. adsorption, release, synthesis, uncoating, assembly, and penetration. D. assembly, synthesis, uncoating, release, penetration, and adsorption. E. penetration, uncoating, synthesis, adsorption, assembly, and release.
A microorganism found living under conditions of high ________ is a barophile
A) pH values B) oxygen concentrations C) hydrostatic pressure D) carbon dioxide levels E) salt concentrations