Alcohol has diuretic effects, increasing urine output. By which one of the following is this mediated?
A) Alcohol increases the amount of sodium reabsorbed.
B) Alcohol decreases the amount of sodium reabsorbed.
C) Alcohol makes the renal tubules more permeable to water.
D) Alcohol inhibits the release of ADH.
E) Drinks with alcohol also contain a lot of water, and the kidneys excrete this.
D
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In the late 1960s, Carrell Williams and Karel Slama discovered that the insect Pyrrhocoris apterus, when grown in jars with paper towels made from balsam fir, underwent several extra larval molts and finally died without completing metamorphosis
Further investigation led to the conclusion that the fir trees synthesize a hormonal analog that acts as an insecticide. The molecule is actually an analog of juvenile hormone. Furthermore, the juvenile hormone analog discovered by Salma and Williams has no effect on most other metamorphosing insects, suggesting that: A. many insects reproduce as larvae. B. there has been some evolutionary divergence in the structure of juvenile hormone and in the juvenile hormone receptors of different insects. C. not all insects utilize juvenile hormone to stimulate metamorphosis. D. other insects have evolved methods to detect the juvenile hormone analog and are not found in balsam firs.
A series of markers have the following frequencies. Which would be the most useful for DNA profiling?
A) 1/60 B) 1/5200 C) 1/500 D) 1/40
Antihistamines relieve allergy symptoms by ____
a. inhibiting the release of histamines and cytokines b. binding directly to histamines c. destroying mast cells before they can produce histamines d. binding to the allergens e. stimulating effector T cells to produce more cytokines
In reference to enzyme activities, repressors ________ the active site, while activators ________ it.
A. stimulate, repress B. disrupt, restore C. restore, disrupt D. promote, disrupt E. disrupt, promote