In which of the following settings have exotic species posed a larger threat to the native biota?
A) islands
B) mainland areas
C) A and B about equally
Ans: A) islands
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Hans Spemann and Hilde Mangold conducted pioneering experiments in which they transplanted the dorsal lip of the blastopore in an early gastrula newt to the ventral side of another early gastrula newt. What was the outcome of this experiment?
A. Discovery of Spemann's organizer. B. The development of dorsal structures (neural tube, notochord) on both the dorsal and ventral parts of the gastrula that received the transplant. C. Identification of a morphogenic field in the dorsal lip of the blastopore of an early gastrula. D. Discovery of a group of embryonic cells in the dorsal lip that ultimately produce specific body structures. E. All of the choices are correct.
What part of the neuron is responsible for most of the "house-keeping" tasks of the cell, including protein synthesis?
A. myelin B. axon C. dendrite D. soma E. synapse
What chemical causes death in many eukaryotes because it blocks cytochrome C oxidase?
A. Oxygen B. Iron C. Carbon monoxide D. Cyanide E. Copper
Cell-to-cell communication by quorum sensing has been shown to be important in the regulation of genes needed for ________.
A. plasmid transfer B. biofilm production C. virulence D. All of the choices are correct.