Polygenic traits often demonstrate a ________ distribution when the phenotypes from a proper sample are represented in a histogram
A) Poisson B) uniform C) normal D) binomial
Answer: C
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You are conducting a long term study of ecosystem functioning in a freshwater lake. You and your field assistants gather data for many biotic and abiotic factors, including species diversity, water and benthic quality, and turbidity. Over the ten years of your study, you find that the abundance of water lilies is correlated with several other factors. When water toxicity and turbidity are high and water pH is abnormally low, water lilies quickly become scarce, followed by periods where fish, amphibians, and water birds are also scarce or absent. In years water nutrient levels are very high, water lilies quickly become abundant, followed by years where wading birds are scarce. From these data, you conclude that water lilies are __________.
A. an umbrella species. B. a keystone species. C. an endemic species. D. a flagship species. E. an indicator species.
Only the leading strand of a DNA molecule serves as a template during replication
Indicate whether the statement is true or false
The resting potential of a typical neuron is approximately +70 mV
____________________ Indicate whether the statement is true or false.
To mobilize more glucose during fasting,
A. only glucagon will increase. B. cortisol, epinephrine, and glucagon will all increase. C. only glucagon and cortisol will increase. D. only cortisol will increase. E. only epinephrine will increase.