All animals, whether large or small, have _____
A) an external body surface that is dry
B) a basic body plan that resembles a two-layered sac
C) a body surface covered with hair to keep them warm
D) most of their cells in contact with an aqueous medium
D
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The cell body of a motor neuron resides in the spinal cord, but it may control muscles a long distance away. In a giraffe, the ________ of a leg motor neuron may be six feet long!
A. dendrite B. soma C. axon D. node of Ranvier
An invertebrate statocyst contains ____, which surround movable ____; changes in body position move the latter,
triggering action potentials.
a. statoliths; sensory hair cells b. sensory hair cells; statoliths c. otoliths; sensory hair cells
d. efferent neurons; otoliths e. efferent neurons; statoliths
Which of the following are not proteins of the immune system?
What will be an ideal response?
In DNA replication, RNA primer is necessary because
A. DNA synthesis starts and stops many times before completed. B. DNA synthesis begins at multiple origins of replication. C. the two strands of a replicating helix must make a full rotation to unwind. D. DNA polymerase is unable to initiate a new polynucleotide chain.