Which of the following is true of leptin?
a. Leptin is a product of protein metabolism.
b. Leptin levels are decreased during overeating and obesity.
c. Mutations of the leptin gene are the most common cause of obesity.
d. Plasma leptin levels are related to body fat content only in obese persons.
e. Obese humans have high plasma leptin levels and are insensitive to leptin injection.
Answer: e. Obese humans have high plasma leptin levels and are insensitive to leptin injection.
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Which of the following circumstances is most likely to encourage the successful use of analogies in problem solving?
a. requiring people to use a mental set b. having people study the source problem very carefully, rather than simply trying to solve it c. having people try to solve several problems that are structurally similar, before they see the target problem d. encouraging people to compare at least two problems that have different structural features
When people try to solve problems, which feature of the problem should they emphasize the most?
a. structural features b. surface features c. schematic features d. algorithms