In an atom, the electrons are
a. housed within the nucleus.
b. moving through the nucleus.
c. present in various energy shells.
d. usually at rest, but occasionally move.
e. positively charged.
C
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Purines and pyrimidines are components in the building block units of all ________.
A. nucleic acids B. enzymes C. polysaccharides D. amino acids E. carbohydrates
An Italian physician, ________, challenged the concept of spontaneous generation by demonstrating that maggots do not arise from decaying meat but rather from developing fly eggs.
Fill in the blank(s) with the appropriate word(s).
The most important pain receptors are
a. chemoreceptors. b. baroreceptors. c. stretch receptors. d. nociceptors. e. osmoreceptors.
Defending the body against bacterial infection and invasion by foreign substances is a function of
a. red blood cells b. plasma c. platelets d. white blood cells