Homologous structures, such as arms, wings, and fins, are constructed from the same basic bones and are adapted to locomotion in different environments. Which idea do such structures support?
a) inheritance of acquired traits
b) descent with modification
c) tendency toward perfection
d) artificial selection
Ans: b) descent with modification
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Your patient is in the hospital due to left heart failure. In your observation, you notice that she has a very low pulse oximeter reading, her skin is turning blue, and she appears to be in respiratory distress (rapid shallow breathing). You immediately call the doctor because you recognize that these symptoms indicate ________,a life-threatening situation.
A) internal bleeding B) decompression sickness C) myocardial infarction D) prolapsed heart valve E) pulmonary edema
Which event represents the process of releasing chemical mediators?
A. Binding of IgE by the Fc region to mast cells and basophils B. Binding of allergen to adjacent IgE binding sites on mast cells and basophils C. Histamine acting on smooth muscle D. Degranulation E. Prostaglandins causing vasodilation and increased vascular permeability
Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as _____
A) a noncompetitive inhibitor of the enzyme B) an allosteric activator of the enzyme C) a cofactor necessary for enzyme activity D) a coenzyme derived from a vitamin
Dopamine plays a central role in the working of the brain's built-in reward circuit.
Answer the following statement true (T) or false (F)