Bilateria are characterized by
A. a plane of symmetry that forms mirror images around a vertical plane in the midline.
B. a plane of symmetry that forms mirror images around a horizontal plane in the midline.
C. a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images.
D. a plane of symmetry that forms mirror images around an oblique plane in the midline.
E. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body.
A. a plane of symmetry that forms mirror images around a vertical plane in the midline.
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Which of the above letters represents the brain or
controlling system of nerve reactions in this organism? a. A b. B c. C d. D e. none of these
The major difference between the smooth and rough ER is that ____
a. smooth ER is isolated to the nucleus b. vesicles are found only in the smooth ER c. rough ER contains ribosomes d. smooth ER is the site of polypeptide synthesis e. rough ER is the site of lipid synthesis
The "one gene-one enzyme" hypothesis states that
A) the synthesis of each gene is catalyzed by one specific enzyme. B) the synthesis of each enzyme is catalyzed by one specific gene. C) the function of an individual gene is to dictate the production of a specific polypeptide. D) the function of each polypeptide is to regulate the synthesis of each corresponding gene.
What type(s) of microbial interactions take place in a microhabitat?
A. antagonism B. cooperation C. competition D. antagonism and competition E. a combination of antagonism, cooperation, and competition