The sensory nerves of the somatic portion of the peripheral nervous system:a
transmit information from internal receptors to the central nervous system.
b. transmit information from sensory organs to the central nervous system.
c. transmit information from the central nervous system to glands.
d. transmit information from the central nervous system to skeletal muscles.
e. regulate cardiac activity
b
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Being heterozygous for the hemoglobin gene variant that causes the disease sickle-cell anemia can be advantageous in what situation?
A. in areas where malaria is endemic B. when iron intake is too low in the diet C. in elite athletes because it slightly decreases oxygen affinity D. when a person has anemia caused by other factors E. when a person is at high altitude
Atmospheric levels of carbon dioxide have rapidly increased since the industrial revolution. One effect of increased atmospheric CO2 is global warming. What effect does increased CO2 have on plants?
A. plants may no longer need light for photosynthesis. B. some crops such as tomatoes and cucumbers may experienced enhanced growth rates. C. plants may be able to absorb carbon dioxide even with their stomata closed. D. C4 photosynthesis may become more important than C3 photosynthesis.
A "structuralist" biologist would explain an organism's features as the result of ________
A) natural selection acting on random, small-scale variation B) the inheritance of traits acquired over an individual's lifetime C) principles of mathematics and physics that determine form and function D) major "leaps" or "jumps" in phenotype within one generation E) divine intervention in an organism's DNA
Bacteria make up about ________ the weight of fecal matter
a. one-fourth b. one-third c. one-half d. one-fifth