The biological species concept cannot be applied to ____
a. animals that interbreed
b. crossbreeding plants
c. protists that interbreed
d. animals that reproduce sexually
e. plants that reproduce asexually
ANSWER: e
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A researcher creates a mutant pea plant in which cytokinins are over-expressed and gibberellic acid is under-expressed. What is the most likely phenotype of this mutant pea plant?
A. The pea plant would be shorter with more branches compared to wild-type plants. B. The pea plant would be taller with more branches compared to wild-type plants. C. The pea plant would be shorter with fewer branches compared to wild-type plants. D. The pea plant would be taller with fewer branches compared to wild-type plants.
Laboratory diagnosis of HIV infection is usually made by which of the following?
A) electron microscopy B) growth of HIV in cell culture C) growth of HIV in embryonated chicken eggs D) immunodiagnostic procedures for the detection of antigen and antibodies
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 swimming motion B. Directional movement toward the food particle using a gliding motion C. Directional movement toward the food particle using an amoeboid motion D. No movement because the cell synthesizes its own food E. No movement because it is cemented in place
Deforestation:a
retards soil erosion. b. releases carbon dioxide that may contribute to global warming. c. has no effect on the extinction of biological species. d. promotes the preservation of tropical birds. e. is only a threat to tropical rain forests.