Which amino acid is classified as "electric" based on a specific mnemonic?

• A. Please Think Twice
• B. Good Spaghetti Always Comes (with) Tomatos
• C. Her Red Dress Kills (at) Events
• D. Santas Team Crafts New Quilts Yearly

Answer: (C)

The correct classification of "electric" for amino acids can be attributed to the mnemonic "Her Red Dress Kills (at) Events," which denotes the amino acids that are charged at physiological pH. This mnemonic represents the amino acids that possess acidic or basic side chains, giving them an overall charge, which is what makes them classified as "electric." The mnemonic lists:

• Her (Histidine)

• Red (Arginine)

• Dress (Aspartate)

• Kills (Lysine)

• (at) - accounting for two additional amino acids categorized based on their charge

• Events (Glutamate)

These arcane associations emphasize the importance of amino acid properties in biochemical contexts, especially in protein interactions and enzyme functions, where the charge of these side chains can affect binding and activity.

The other mnemonics provided refer to different classifications of amino acids and do not encompass the "electric" nature associated with charged amino acids. Hence, this mnemonic is essential for memorizing the amino acids with charged side chains, reinforcing their classification and relevance in biological systems.