The surface of the cells of some Pseudomonas species are covered in numerous threadlike structures. What is the likely reaction of such a Pseudomonas cell to the presence of a food particle?
A. Directional movement toward the food particle using a gliding motion
B. No movement because it is cemented in place
C. Directional movement toward the food particle using an amoeboid motion
D. No movement because the cell synthesizes its own food
E. Directional movement toward the food particle using a swimming motion
Answer: A
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Gram-negative broth serves which purpose when used in the bacterial fecal culture?
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Which of the following is/are an independent variable(s) in this experiment? A. the amount of ammonium nitrate B. the height of the plants C. the height of the plants and amount of light D. the amount of ammonium nitrate and light E. the amount of light
Biogeography is the study of
a. the distribution of land masses. b. the patterns in the geographical distribution of species. c. the patterns of species dispersal. d. the pattern of population demographics. e. none of these