Neurons tend to differ in their (select all correct choices):
A. function.
B. size and shape.
C. number of extensions.
A,B,C
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The tough outer covering of the eye is referred to as the
A. pupil. B. retina. C. sclera. D. fovea. E. iris.
The atomic number refers to the
a. mass of an atom. b. number of protons in an atom. c. number of both protons and neutrons in an atom. d. number of neutrons in an atom. e. number of electrons in an atom.
The nucleoside triphosphate molecules in DNA are linked together in the 5'?3' by a(n) ________ bridge
A) phosphate B) covalent C) phosphodiester D) peptide E) phosphatidyl
Which of the following causes a decrease in the PO2 of air as it enters the conducting zone of the lungs?
A) warming of the air B) decreasing alveolar PO2 C) the consumption of oxygen D) humidifying the air E) the increasing PCO2