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

Environmental & Atmospheric Sciences

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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

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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

Environmental & Atmospheric Sciences

An example of a nonextractive resource provided by the ocean is ____

A) transportation B) crabs C) oil D) manganese nodules

Environmental & Atmospheric Sciences

The beach face is located in which of the following zones?

a. backshore b. foreshore c. offshore d. none of the above

Environmental & Atmospheric Sciences