Amino acids in solution contain both a negative and positive charge and thus are termed a(n)
A) anion.
B) cation.
C) acid.
D) base.
E) zwitterion.
E
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The blood type considered the universal donor is type ________.
A. A B. B C. O D. AB
A single motor neuron together with all the muscle fibers it innervates is called
A) a myotome B) an end foot C) a dermatome D) an end plate E) a motor unit
Given below are the layers of the respiratory membrane. In what order would oxygen pass through this membrane under normal circumstances?
1) layer of fluid lining the alveolus 2) alveolar epithelium 3) alveolar epithelium basement membrane 4) interstitial space 5) capillary endothelium's basement membrane 6) capillary endothelium A. 6,5,4,3,2,1 B. 4,1,2,3,5,6 C. 1,3,2,5,6,4 D. 1,2,3,4,5,6 E. 2,1,4,3,6,5
The three layers of the eyeball, from outer to inner, are:
A) vascular, neural, and fibrous layers. B) fibrous, vascular, and neural layers. C) fibrous, neural, and vascular layers. D) neural, vascular, and fibrous layers.