For hormones that homeostatically regulate cellular functions, _____
A) negative feedback typically regulates hormone secretion
B) the circulating level of a hormone is held constant through a series of positive feedback loops
C) both lipid-soluble hormones and water-soluble hormones bind to intracellular protein receptors
D) endocrine organs release their contents into the bloodstream via specialized ducts
E) it is impossible to also have neural regulation of that system
Answer: A
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It is difficult to assign a precise phenotypic definition to alcoholism because _____
a. not enough volunteers agree to participate in genome wide association studies b. alcoholism does not have environmental components c. alcoholism is an innate behavior d. genetic testing for alcoholism is not available e. excessive consumption of alcohol is subjective
About ________ percent of the human genome actually encodes proteins.
A) 0.5 B) 1.5 C) 5.0 D) 10 E) 100
Which of the following descriptions best fits the class of molecules known as nucleotides?
A) a nitrogenous base and a phosphate group B) a nitrogenous base and a sugar C) a nitrogenous base, a phosphate group, and a sugar D) a sugar and a purine or pyrimidine
Bright coloration in birds makes them stand out to predators. In female birds that sit on the nest, bright coloration is rare. This is likely the result of
A) artificial mutations. B) natural selection. C) stabilizing selection. D) coevolution. E) gene flow.