The Suprachiasmic Nuclei

question 57

Multiple Choice

The suprachiasmic nuclei

• A) report changes in light levels during the day and night to the optic nerve.
• B) release growth hormone, which helps repair body tissues.
• C) are located in the brain stem.
• D) control falling asleep and awakening.

---

Definitions:

Phenotype

The set of observable characteristics or traits of an organism, resulting from the interaction of its genetic makeup with the environment.

Protein-Coding Sequence

A segment of DNA or RNA that is translated into a protein, containing instructions for the amino acid sequence of the protein.

Gene Expression

The process by which information from a gene is used to synthesize a functional gene product, often a protein, which can affect a cell's structure and function.

Signal Molecules

Chemical substances produced by cells that are used to communicate with or signal other cells, orchestrating a wide range of physiological responses.