The reduction of atmospheric nitrogen to ammonia is called ________.
A. nitrification
B. denitrification
C. nitrogen fixation
D. ammonification
Answer: C
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A single seed lands on one of a group of isolated islands. Several million years later, its descendants
have evolved into a number of new species on the different islands, representing a variety of trees, shrubs, and vines. At that point in time, we have an example of
a. adaptive radiation. b. punctuated equilibrium. c. genetic drift. d. microevolution. e. mutation.
Irrigated land accounts for approximately what percentage of human food production?
a. 10 b. 30 c. 50 d. 75 e. 90
What is identified through the technique of replica plating?
a. auxotrophic bacteria b. a heterozygote c. prototropic bacteria d. phototropic bacteria
Which of the following is NOT an adhesion mechanism that bacteria use to attach to a host?
A) fimbriae attach to epithelium of host B) glycocalyx anchors the microbe to the host C) dextran slime layer glues the microbe to the host surface D) envelope spikes puncture cells for entry