When Exposed to Ultraviolet Light, Keratinocytes Convert a Steroid Precursor

question 12

Multiple Choice

When exposed to ultraviolet light, keratinocytes convert a steroid precursor into ________, a molecule that is crucial for regulation of calcium levels.

• A) calcitriol
• B) cholecalciferol
• C) calcitonin
• D) creatine
• E) phosphorus

---

Definitions:

Fundamental Adaptive Motive

An innate drive that guides behavior and decision-making for adaptation and survival.

Classical Conditioning

A learning procedure in which a biologically potent stimulus is paired with a previously neutral stimulus to produce a behaviorally significant response.

Satiety Cues

Internal signals generated by the body to indicate fullness and regulate food intake, contributing to the cessation of eating.

Delay Gratification

The process of resisting an immediate reward in preference for a later, often greater, reward.