Why Do Some Signals ("First Messengers") Trigger "Second Messengers" to Activate

question 9

Multiple Choice

Why do some signals ("first messengers") trigger "second messengers" to activate target cells?

• A) The first messenger requires activation by ATP.
• B) The first messenger is not water soluble.
• C) The first messenger binds to many types of cells.
• D) The first messenger cannot cross the plasma membrane.
• E) There are no receptors for the first messenger.

---

Definitions:

Support

Assistance or encouragement provided to individuals or entities, often aimed at helping them overcome challenges or achieve goals.

Diverse

Characterized by variety or differences, often used to describe inclusive representation of different races, genders, ages, or cultural backgrounds.

Innovation

The creation of new ideas and their implementation or commercialization.

Limited Value

Something that has restricted worth or importance, often due to specific conditions or contexts.