When an atom or molecule gains one or more electrons, it is said to be:
A. oxidized.
B. reduced.
C. energized.
D. polarized.
Answer: B
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Describe the insulating sheaths on axons and dendrites in the nervous systems. How do these help to speed transmission of neural messages?
What will be an ideal response?
Incompatibilities between the developing embryo and the maternal organism that cause the embryo to
abort spontaneously may prevent individuals of different populations from producing fertile offspring. Such differences may be an example of a. isolating mechanisms. b. allele frequencies. c. mutations. d. founder effects.
e. gene flow.Antibiotics have ____ cells as their targets.
A. animal B. eukaryotic C. fungus D. bacterial
The P wave of the ECG represents
A. the depolarization of the atria. B. the relaxation of the atria. C. the contraction of the ventricle. D. the repolarization of the atria. E. the contraction of the atria.