Why would a patient with a defect in the obese (ob) gene continue to gain weight while a patient with the normal gene would not? Assume they both eat the same diet and are the same height
What will be an ideal response?
The obese gene carries the instructions to make leptin, the fat-controlling hormone. A defect in this gene would lead to little leptin being made; thus, the brain of that patient continues to try to add to the fat stores by increasing appetite and slowing metabolism.
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In the picture below, what is encircled?
A. A single chromosome B. A pair of homologous chromosomes C. Two sister chromatids D. A sister chromatid
What will be the immediate action of an allergen when it enters the body for a second time?
A. Binding of allergen to adjacent IgE binding sites on mast cells and basophils B. Binding of IgE by the Fc region to mast cells and basophils C. Prostaglandins cause vasodilation and increased vascular permeability D. Degranulation E. Histamine acts on smooth muscle
The hormone erythropoietin acts to stimulate cells that are located in the ________ of an adult
A) spleen B) blood C) kidneys D) red bone marrow
________ dating uses ratios of potassium to argon and can be used to determine absolute age
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