A polar receptor is positively charged.
a. true
b. false
Answer: b. false
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
A) microbiology. B) immunology. C) epidemiology. D) virology.
A squirrel living in a park bisected by a busy street passes on a mutation to its offspring that allows them to judge the speed and distance of passing cars more accurately based on the vibration they cause in the ground. Over several generations, the percentage of squirrels expressing this mutation increases equally on both sides of the street. What principle does this demonstrate?
a. founder effect b. genetic drift c. microevolution d. equilibrium
Four of the following are shared characteristics of parabasalids and diplomonads. Which is the exception?
a. heterotrophy b. flagella c. oxygen-poor or anaerobic habitats d. abundant mitochondria e. presence of a pellicle
In humans, the body needs to maintain oxygen levels within narrow homeostatic ranges. If the blood oxygen level drops below that range, the body responds by
A) using positive feedback to further lower the oxygen level. B) using negative feedback loops to return the oxygen level to normal. C) setting this lower oxygen level as the new normal. D) using positive feedback to raise the oxygen level. E) using negative feedback loops to further lower the oxygen level.