Which of the following is NOT involved in nitrogen
fixation?
a. breaking triple bonds
b. production of NH3
c. production of NO3–
d. production of NH4+
e. All of these are involved in nitrogen fixation
Answer: e
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Mouse pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over
b (brown). D is dominant over d. Homozygous d is epistatic to the black and brown genes. Given this information, what will result from a F1 cross between two mice?
a. 9/16 black, 3/16 brown, 4/16 white b. 9/16 white, 3/16 brown, 4/16 black c. 9/16 black, 6/16 brown, 1/16 white d. 9/16 white, 6/16 brown, 1/16 black e. All black mice
The veins of leaves are used for
a. support. b. identification. c. transport of water and nutrients. d. detachment in the autumn. e. regeneration.
Joseph Lister ________.
A. pioneered the use of gamma rays for sterilizing food B. designed and built the first autoclave C. demonstrated that microorganisms are carried on dust particles in the air D. revolutionized surgery by introducing phenol as a disinfectant
Deforestation in the boreal forests is due primarily to:
a. commercial logging for rare woods to be used in furniture. b. commercial logging subsistance agriculture. c. clear-cut logging for industrial wood. d. slash-and-burn agriculture for farming e. slash-and-burn agriculture for cattle ranching