A massive immigration of Irish to the United States in the mid-19th century because of a failure of the Irish potato crop was most likely caused by what protist?
A. Phytophora infestans
B. Giardia lamblia
C. Trichomonas vaginalis
D. Plasmodiuim falciparum
E. Pfiesteria shumwayae
Answer: A
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At the end of the Gram staining procedure, Gram-positive bacteria will be:
A) blue-to-purple. B) green. C) orange. D) pink-to-red.
RNA is a ______________
a. polymer b. monomer c. none of the above
In a female human cell, what would be the effect on X inactivation if a mutation occurred in the Xist gene making it nonfunctional?
A. Both of the X chromosomes would become inactivated. B. Only the paternal X chromosome would become inactivated. C. Only the maternal X chromosome would become inactivated. D. Neither of the X chromosomes would become inactivated. E. One of the two X chromosomes would become inactivated.
Which of the following bacterial genera plays an important role in environmental nitrogen cycles?
A) Nitrobacter B) Rhizobium C) Azospirillum D) both Nitrobacter and Rhizobium E) Nitrobacter, Rhizobium, and Azospirillum