________________ is directional growth responses of plants to a unidirectional source of light.
A. Gravitropism
B. Thigmotropism
C. Dormancy
D. Phototropism
E. Thermotropism
D. Phototropism
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Interrupted mating is defined as ____________
A. the inability of a bacteriophage to transfer genetic material B. a mechanism of transformation C. a process of asexual reproduction in bacteria D. a process by which conjugation is stopped using a blender
The continental crust is primarily comprised of all the following except:
a. granite-type rock. b. basalt-type rock. c. quarts-type rock. d. silicon-type rock. e. sedimentary rock.
Most known microorganisms maintain their internal pH ________.
A. near neutral (pH 7) B. slightly alkaline (pH 8-10) C. slightly acidic (pH 4-6) D. near their optimum growth pH
Microorganisms require large quantities of this nutrient for use in cell structure and metabolism:
A. element B. macronutrient C. water D. growth factor E. trace element