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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The meristems that arise from the apical meristem include all of the following EXCEPT

A. ground meristem. B. procambrium. C. epidermis. D. protoderm.

Biology & Microbiology