Which of the Following Forms of Vitamin a Is Covalently $\beta$

question 17

Multiple Choice

Which of the following forms of vitamin A is covalently attached to a lysine residue of the protein opsin to form the complex called rhodopsin?

• A)all-trans-retinal
• B)11-cis-retinal
• C)all-trans-retinoic acid
• D)all-trans-retinol
• E)\(\beta\)-carotene

---

Definitions:

Initial Public Offerings (IPOs)

The method where a privately-held company offers its stock to the broader public for the initial time.

SUPERDOT

A now obsolete electronic system used by the New York Stock Exchange for routing orders directly to the trading floor, replacing manual order handling.

Specialist

A financial expert who possesses a deep understanding of specific securities or sectors, often responsible for facilitating trades by matching buyers with sellers.

Securities Investor Protection Corporation (SIPC)

A non-profit organization that protects customers of brokerage firms that are forced into bankruptcy, providing a safety net for investors' assets.