The Second Messengers Inositol Trisphosphate, Calcium Ions, and Nitric Oxide

question 142

Multiple Choice

The second messengers inositol trisphosphate, calcium ions, and nitric oxide are all similar in that they can

• A) phosphorylate protein kinases to activate them.
• B) diffuse through cell membranes to carry a signal into adjacent cells.
• C) be controlled by the opening and closing of ion channels.
• D) be embedded in a cell membrane in an inactive form.
• E) bind to noncatalytic sites on enzymes to activate them.

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