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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In many mammalian species, including bats and most non-human primates, a bone in the penis, called
the ____, helps to maintain it in an erect state.
a. pendulum b. baculum c. colostrum d. gametogonium e. marsupium
The meristems that arise from the apical meristem include all of the following EXCEPT
A. ground meristem. B. procambrium. C. epidermis. D. protoderm.
Transcription factors include ______________.
A. promoters and insulators B. silencers and enhancers C. activators and repressors D. activators, repressors, and translational factors E. enhancers and repressors
To process information, postsynaptic neurons often add up simultaneous signals from several presynaptic neurons. Which structure and process allow them to do so?
A. Dendrites; temporal summation B. Axons; temporal summation C. Dendrites; spatial summation D. Axons; spatial summation