Select the amino acid from the list provided that is not charged Question 88Select one: a. Glutamine b. Aspartate c. Lysine d. Arginine e. Histidine

Break Down the Problem

1. Identify the characteristics of the amino acids listed.
2. Determine which amino acid has no net charge at physiological pH.

Relevant Concepts

• Amino acids can be classified based on their side chains as charged (acidic or basic) or uncharged (neutral).
• At physiological pH (around 7.4), amino acids can exist in charged or uncharged states depending on their side chains.

Analysis and Detail

1. Glutamine: This amino acid has a polar uncharged side chain and is considered neutral.
2. Aspartate: This amino acid is acidic and carries a negative charge at physiological pH.
3. Lysine: This amino acid is basic and carries a positive charge at physiological pH.
4. Arginine: This amino acid is also basic and carries a positive charge at physiological pH.
5. Histidine: This amino acid can be positively charged or uncharged depending on the pH but still leans towards being basic.

Verify and Summarize

Given the characteristics above:

• The only amino acid without a net charge at physiological pH is Glutamine.

Final Answer

a. Glutamine is the amino acid from the list that is not charged.