Select the potential problems with using current dispersal barriers (for example, a mountain range) to delineate biogeographical regions. Check all that apply.
_____ A barrier for one group of organisms may not be a barrier for another group of organisms.
_____ The world's biota correspond more closely to political boundaries.
_____ Global climate change may change the distribution of taxa and the size and/or location of some of the dispersal barriers.
_____ Human conflicts lead to ever-changing political boundaries.
_____ Distantly related organisms with similar appearance and habits may exist on either side of a dispersal barrier.
__X__ A barrier for one group of organisms may not be a barrier for another group of organisms.
_____ The world's biota correspond more closely to political boundaries.
__X__ Global climate change may change the distribution of taxa and the size and/or location of some of the dispersal barriers.
_____ Human conflicts lead to ever-changing political boundaries.
_____ Distantly related organisms with similar appearance and habits may exist on either side of a dispersal barrier.
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Attribute one of these statements to the blastopore.
A. it occurs in both protostomes and deuterostomes. B. it is the opening from the coelom to the outside of the animal. C. it is the opening from the archenteron to the coelom. D. it can develop into the brain in some animals. E. it can develop into the gut in some animals.
What is the difference between a decomposer and a detritivore?
What will be an ideal response?
Biology books earlier in this century assumed that the earliest protocells would have to be autotrophs. This concept appears to be
A. correct, since heterotrophs would depend upon eating autotrophs. B. correct, since life is not possible without ATP, which is only available in living systems. C. correct, since glycolysis and fermentation only occur after oxygen is present from photosynthesis. D. incorrect, since the primordial soup could contain many preformed food molecules. E. incorrect, since glycolysis and fermentation require complex enzymes for catalytic reactions.
Mastitis in cows results in infected mammary glands. The use of biotechnologies to introduce the antibiotic gene lysostaphin from Stpahylococcus simulans is an example of generating what type of animal?
A) a knock-out animal B) a synthetic animal C) a transgenic animal D) a conditional knock-out animal