Andrew Hendry and colleagues demonstrated that the process of speciation is gradual by studying the distribution and variation in gill raker length in ________
A) brook trout
B) aquatic copepods
C) salmonids
D) threespine sticklebacks
E) razorfish
D
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A construction company has cleared all the trees from an area near a river in order to build luxury homes with unobstructed views of the river. What do you predict will be the effects of this action? Check all that apply.
_____ An increase in the volume of water running off into the river. _____ A decrease in the amount of nutrients leached from the soil. _____ An increase in the concentration of nutrients in the run off entering the river. _____ A build up of inorganic nutrients in the soil of the deforested area. _____ Increased weathering of rocks in the deforested area.
Which of the following is NOT an example of genetic recombination between different species in nature?
A) Bacteria that acquire foreign plasmids B) Viruses that transfer DNA between host organisms C) Bacterial transformation D) Sexual reproduction
Which of the following repair systems always results in direct repair of the DNA damage?
a. nucleotide excision-repair b. mismatch repair c. recombination-repair d. photoreactivation e. base excision-repair
In terms of water testing, what are indicator bacteria?
A) Species of bacteria that are human pathogens. B) Species of bacteria that are part of the normal intestinal flora of birds and mammals.