Mitochondria arose by endosymbiosis of ______.
A. an anaerobic bacterium
B. a photosynthetic bacterium
C. an aerobic bacterium
D. an aerobic archaeon
E. a photosynthetic archaeon
Answer: C. an aerobic bacterium
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The "QRS" complex visible in a normal electrocardiogram is associated with the
A. excitation from the AV node and depolarization of the ventricles. B. excitation from the SA node and depolarization of the atria. C. excitation from the SA node and repolarization of the ventricles. D. excitation from the AV node and repolarization of the atria. E. activity in the vagus nerve and release of acetylcholine.
It is usually beneficial to add nitrogen when one attempts to stimulate hydrocarbon degradation in the ocean.
Answer the following statement true (T) or false (F)
In this type of immunity, the response is
immediate, the antigen is detected by a fixed set of receptors, and does not persist. This type of immunity is
a. innate. b. adaptive. c. antibody-mediated d. cell-mediated. e. more than one of these
If the members of a population are small in size, mature early, and have high parity and fecundity, they are
A. r-strategists. B. K-strategists. C. neither K-strategists nor r-strategists, but have characteristics of both.