In obesity studies in mice, the binding of leptin activates the leptin receptor and initiates changes in ____ in the hypothalamus
a. nucleotide sequences
b. cell membranes
c. mitochondria
d. fat storage
e. gene expression
e
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When a protein denatures, it ____
a. changes shape b. changes temperature c. changes pH d. binds more efficiently to its cofactor e. catalyzes reactions more efficiently
If you didn't consume enough niacin (vitamin B3), you would have diarrhea since you would have what disease?
A. scurvy B. pellagra C. rickets D. beriberi E. anemia
Modern biologists still might consult the results of the Challenger expedition in order to:
A) Look at their charts of the South Pole. B) See the results of experiments in their on-board scientific laboratory. C) Consult Edward Forbes' reports on the fauna. D) Compare their deep-sea specimens with those taken by this expedition.
An agricultural worker experiences difficulty breathing which becomes progressively worse. Tests show inflammation and damage of the lung tissue, but IgE antibodies and granulocytes are in the normal ranges. With which disorder of the immune system are these signs and symptoms consistent?
A. allergic reaction B. type III (immune complex-mediated) hypersensitivity C. type IV (delayed) hypersensitivity D. autoimmunity E. acquired immunodeficiency