Which of the following is NOT a trait of rickettsias?
A) They are obligate intracellular parasites.
B) They lack cell walls.
C) They have not been cultivated in the absence of host cells.
D) Both the host and parasite are required in order to be alive and metabolically active.
Answer: B
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Which of the following is not evidence supporting the Lyon hypothesis of X inactivation?
A. Female mammals that are heterozygous for X-linked traits are phenotypically mosaics. B. A highly condensed structure is consistently observed in female cells, but not in male cells. C. A female cat that is homozygous for coat color cannot produce calico offspring. D. Calico patterns of coat color are never exactly the same. E. A genetically normal male cat can never be calico.
Which of the following ions is associated with auxin and used during signal transduction that causes a plant to bend towards a light source?
A. H+ B. Ca2+ C. Mg2+ D. Na+
Which of the following is NOT a basic taste category identified in humans?
a. bitter b. salty c. spicy d. sour e. sweet
What kind of evidence has recently made it necessary to assign the prokaryotes to either of two different domains, rather than assigning all prokaryotes to the same kingdom?
A) mtDNA B) rRNA genes C) morphological D) ecological