Which of the following structural features is found in all catecholamines?
A) the presence of two hydroxyl group in meta positions on a benzene ring
B) the presence of two hydroxyl groups in ortho positions on a benzene ring
C) the presence of two hydroxyl groups in para positions on a benzene ring
D) none of the above
B
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One potential problem associated with global warming is that rising sea levels will cause salt contamination of coastal area soils
Indicate whether the statement is true or false
What is the main tenet of the lock-and-key model for drug activity?
A. The biological lock of an enzyme can be activated by using certain chemical keys. B. The key to a drug's success is to keep it locked away from stomach acid. C. Only certain biological keys can unlock the potential of a drug. D. There is a connection between drug structure and drug shape. E. all of the above
An example of a nonextractive resource provided by the ocean is ____
A) transportation B) crabs C) oil D) manganese nodules
The beach face is located in which of the following zones?
a. backshore b. foreshore c. offshore d. none of the above