In an uncharged atom, the number of protons and ___________ must be equal.

A) electrons
B) neutrons
C) neurons
D) ions
E) particles


A) electrons

Biology & Microbiology

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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.

Biology & Microbiology

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%

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology