The movement of 25-year-old fertile individuals between Mexico and Canada will eventually
contribute to:
a. genetic drift.
b. directional selection.
c. natural selection.
d. gene flow.
e. mutation.
D
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A) testosterone B) estradiol C) cortisol D) aldosterone E) epinephrine
Lactic acid bacteria such as Lactococcus
A. produce catalase. B. are obligate fermenters. C. require anaerobic environments. D. use oxygen as a final electron acceptor.
"H zones" in skeletal muscle are composed of
a. discs to which thin filaments are anchored. b. stacked thick filaments along with parts of thin filaments that overlap both ends. c. thin filaments but no thick filaments. d. thick filaments but no thin filaments. e. discs to which thick filaments are anchored.
Where do axons of olfactory receptors synapse with interneurons?
a. olfactory bulb b. ganglia c. spinal cord d. nasal cavity e. peripheral nerve