________________ is directional growth responses of plants to a unidirectional source of light.  

A.  Gravitropism
B.  Thigmotropism
C.  Dormancy
D.  Phototropism
E.  Thermotropism


D.  Phototropism

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology