Which of the following would test positive for the tuberculin response?
A) someone who has previously had tuberculosis
B) someone who has been immunized with the tuberculosis vaccine
C) someone who has previously been injected subcutaneously with tuberculin
D) someone who has been immunized with the tuberculosis vaccine or has previously had tuberculosis
E) someone who has been immunized with the tuberculosis vaccine or previously been injected subcutaneously with tuberculin
D
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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. Paracrine signaling may be disrupted in obese people with high levels of leptin. B. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. C. The form of leptin released by obese people may lack protein kinase activity. D. In obese people with high levels of leptin, the leptin is a non-functional second messenger.
The measured distance between genes D and E in a two-point testcross is 50 map units. Where are genes D and E in relation to each other? (Select all that apply.)
A) D and E are on different homologous chromosomes. B) D and E are on the same chromosome, at least 50 map units apart. C) D and E are on the same chromosome, exactly 50 map units apart. D) D and E are on the same chromosome, less than 50 map units apart.
In a reversible chemical reaction at equilibrium, the concentration of X (the reactant) is 0.75 mol/L, and the concentration of Y (the product) is 2.25 mol/L. At 25°C, what would be the Keq?
A) 0.33 B) 3.0 C) 1.69 D) 1.50 E) 37.5
In autosomal dominant inheritance, ____
a. the trait often skips generations b. about one-fourth of the progeny in a pedigree will show the trait c. two affected individuals may have unaffected children d. males are more affected than females e. the aa phenotype will be affected