Strategies for combating drug resistance include all but which practice?
A) Responsible and appropriate drug therapy prescribed by medical personnel
B) Limitation of non-medical uses of antibiotics in humans
C) Responsible use of drugs by patients
D) Restrictions on the use of antibiotics in animal feeds
E) Distribution of free prescription drugs to underdeveloped countries
Ans: E) Distribution of free prescription drugs to underdeveloped countries
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You track aquatic coastal levels of nitrogen and phosphorus at high latitudes and notice a sharp increase in the winter and then again in the spring. What do you expect the effect of these nutrient increases will be on the plankton populations?
A. sharp spikes in population levels at essentially the same time (or, in phase) with the spikes in nutrients B. sharp spikes in population levels some time after (or, out of phase) with the spikes in nutrients C. a sharp spike in population levels in the spring, when light levels are higher; not much of a response in winter D. no effect of the changes in nutrient concentration on the plankton populations in either winter or spring
Because a steroid hormone is nonpolar, it ____
a. must be transported across a cell membrane with a receptor molecule b. is equipped with specific receptor molecules c. can dissolve in blood d. can diffuse directly across a cell membrane e. is an inhibiting hormone
A sensory communication pathway involves
a. reception of stimulus energy. b. transduction of stimulus energy to electrochemical energy. c. action potentials traveling along a nerve pathway to the brain. d. brain response leading to sensation and/or perception. e. all of these.
Abscisic acid synthesized in the root travels to different parts of the shoot where it regulates transpirational water loss. What is the most likely way that ABA travels from the root to the various locations within the shoot?
A. sieve tubes B. from cell to cell through the plasmodesmata C. vessels and tracheids D. between cell walls