The correct sequence of reagents used in the Gram stain technique is ____
a. iodine, alcohol, safranin, and crystal violet
b. safranin, crystal violet, alcohol, and iodine
c. crystal violet, iodine, alcohol, and safranin
d. crystal violet, alcohol, iodine, and safranin
e. alcohol, iodine, crystal violet, and safranin
ANSWER: c
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Much of the loss of biologically available nitrogen in the ocean is now thought to be due to a consortium of microbes carrying out ________.
A. denitrification B. the anammox reaction C. nitrogen fixation D. nitrification
Predict the rank order of the following locations from lowest species richness to highest species richness, using the latitudinal gradient of species richness to form your prediction:
temperate forest in North Carolina, steppe in Patagonia (southern tip of South America), rainforest in Costa Rica, boreal forest in Ontario (east-central Canada) A. Steppe in Patagonia, Boreal Forest in Ontario, Temperate Forest in North Carolina, Rainforest in Costa Rica B. Rainforest in Costa Rica, Temperate Forest in North Carolina, Boreal Forest in Ontario, Steppe in Patagonia C. Boreal Forest in Ontario, Rainforest in Costa Rica, Temperate Forest in North Carolina, Steppe in Patagonia D. Steppe in Patagonia, Temperate Forest in North Carolina, Rainforest in Costa Rica, Boreal Forest in Ontario
Which of the following is not one of the four phases of sexual response?
a. orgasm b. stimulation c. resolution d. plateau e. sexual excitement
The microscope field that appears as a circle when viewing a slide through the ocular and objective lenses is