The bird-tick relationship is an example of ________
A) parasitism
B) mutualism
C) predator-prey
D) commensalism
C
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Many factors are believed to reduce songbird breeding success in fragmented habitats. Select the
exception.
a. brood parasitism by cowbirds b. nest predation by blue jays c. lack of necessary habitat types d. nest predation by domestic cats e. increased connections between habitats
Leptin is a circulating hormone that is produced by fat cells and plays a role in body metabolism and obesity. It normally binds to receptors in the brain and inhibits appetite. Studies have demonstrated that when obese mice that are leptin deficient are injected with leptin they quickly lose their excess weight. Interestingly, however, many overweight people have high levels of leptin in their bloodstream. Why do you think that the high levels of leptin in obese individuals are insufficient to curb their appetite?
A. The form of leptin released by obese people may lack protein kinase activity. B. Paracrine signaling may be disrupted in obese people with high levels of leptin. C. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. D. In obese people with high levels of leptin, the leptin is a nonfunctional second messenger.
Natural Experiments
What will be an ideal response?
TRAIT SPECIESABCDE100100210101310101411100511110611110 The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which pair of species shares the fewest number of derived characters (synapomorphies)?
A. 1 and 6 B. 2 and 3 C. 6 and 3 D. 4 and 6 E. 1 and 4