After eleven years, the descendants of transferred guppies in Venezuela and Trinidad were significantly larger than
their ancestors, indicating that the larger size of guppies was a(n) adaptation to the new environment.
__________________ Indicate whether the statement is true or false.
True
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Toxins can lead to:
a. increased harvestable metals in the ocean. b. reduction in anaerobes in the sediment. c. reduction in primary production. d. increase in primary production. e. increase in individual size and growth rates.
Where does the lens FOCUS an image in the mammalian eye?
a. on the retina, using the entire surface of the retina b. primarily on the fovea c. on the rods only d. slightly in front of the retina, so the neural cells don't distort the image e. it depends on where you are looking; sometimes on the fovea, sometimes elsewhere on the retina
In a woody stem, secondary xylem and secondary phloem can be produced by the
A. vascular bundle. B. casparian strip. C. vascular cambium. D. sieve tube. E. companion cells.
A polyribosome is:
a. a complex composed of several ribosomes and plus an mRNA transcript. b. a complex componsed of several ribosomes in eukaryotes. c. an initiation complex in eukaryotes. d. an elongation complex in eukaryotes. e. one ribosome complexed to several mRNAs