In an uncharged atom, the number of protons and ___________ must be equal.
A) electrons
B) neutrons
C) neurons
D) ions
E) particles
A) electrons
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Lipids are the only class of macromolecules that contain:
A. amino acids. B. nucleotides. C. fatty acids. D. phosphate groups. E. monosaccharides.
What percentage of oxygen in the air is typically extracted by the mammalian lung?
A. less than 25% B. 26–50% C. 51–75% D. 76–90% E. 91–100%
Which are structures formed from the neural crest? (Check all that apply.)
_____ a gill chamber of primitive chordates _____ blastopores _____ sensory neurons of the dorsal root ganglia _____ Schwann cells _____ olfactory and hearing organs
The shared primate characteristic depicted in Figure 22-1 is:
a. a prehensile appendage.
b. an opposable thumb.
c. an enlarged foramen magnum.
d. four grasping digits.
e. an opposable thumb.