The species concept based on careful analysis of the anatomical details of the specimen in question is ________
A) the morphospecies concept
B) the phylogenetic species concept
C) the biological species concept
D) the ecological species concept
A
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The growth of viruses in a culture is described as a one-step growth curve, because
A) virion numbers show no increase during intracellular replication and can only be counted after the virions burst from the host cell. B) there is only one step in the viral life cycle which leads to only one replicative cycle in a culture. C) assembly and release actually occur in one step. D) the eclipse phase prevents the plating and enumeration of virions although new virions are produced at a steady rate during the eclipse phase.
Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?
A) because the Na+ concentration is much lower outside the cell than it is inside B) because the Na+ ions are actively transported by the sodium-potassium pump into the cell C) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior D) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell
Although the specific mechanism of RNA interference has not been fully defined, it involves
A. double-stranded RNA interference with DNA. B. double-stranded mRNA interference with DNA. C. double-stranded RNA interference with mRNA. D. double-stranded DNA interference with mRNA.
A female who is a carrier of the sex-linked gene A has the genotype
a. Aa. b. AA. c. aa. d. XAXa.