Anoxic oxidation of ammonia occurs within membrane-enclosed ________ compartments within cells
a. reaction center
b. carboxysome
c. heterocyst
d. anammoxosome
Answer: D
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Which cation is found in the most abundance in the intracellular compartment?
a. Ca2+ b. K+ c. Li+ d. Na+
Freshwater flatworms have this type of system for osmoregulation.
A. protonephridial B. metanephridial C. osmonephridial D. eunephridial E. isonephridial
A contact lens wearer and cat owner begins to experience problems with her eye. The eye is inflamed and painful, and examination of the eye reveals that the conjunctiva is ulcerating. Which of the following parasites is most likely responsible?
A. Acanthamoeba B. Cryptosporidium parvum C. Entamoeba histolytica D. Toxoplasma gondii E. Trypanosoma cruzi
In DNA transcription, a promoter is _____.
A) a start signal B) a DNA base sequence C) the location that binds RNA polymerase D) all of the choices