Immediately after an action potential occurs, the sodium channels close and cannot be reopened. What is this period called?
What will be an ideal response?
refractory period
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The collars on the cells of choanoflagellates have the function of:
A. protecting the flagellum B. filtering bacterial food from the water C. directing currents away from the flagellum D. storing waste materials of the cell E. attaching to the substrate
The holes in Swiss cheese are produced by the metabolic activities of which bacterial genus?
A. Leuconostoc B. Streptococcus C. Propionibacterium D. Lactobacillus
In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ? silver >>> all silver offspring; (2) silver ? platinum >>> equal numbers of silver and platinum; (3) platinum ? platinum >>> two platinum for each silver offspring. Explain. What will be an ideal response?
Most prokaryotes carry their genetic information in:
A)a single, linear chromosome. B) multiple, circular chromosomes. C) a single, circular chromosome. D) multiple, linear chromosomes. E) two circular chromosomes.