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Which of the following amino acids has a net negative charge at physiologic pH (~7.4)?
- a)Glutamic Acid
- b)Histidine
- c)Lysine
- d)Asparagine
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Which of the following amino acids has a net negative charge at physio...
- Amino acids with acidic side groups carry a net negative charge at physiologic pH.
- Glutamate (glutamic acid) has a side group containing a carboxylic acid.
- Glutamate has a net negative charge at physiologic pH.
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Community Answer
Which of the following amino acids has a net negative charge at physio...
Glutamic Acid
Glutamic acid has a net negative charge at physiologic pH (~7.4) because it possesses a carboxyl group (COOH) that can easily lose a proton, resulting in a negatively charged carboxylate group (COO-).
Explanation:
- Glutamic acid is an amino acid that contains a side chain with a carboxyl group.
- At physiological pH (~7.4), the carboxyl group of glutamic acid will lose a proton, resulting in a negatively charged carboxylate group.
- This negative charge gives glutamic acid a net negative charge at neutral pH.
Other options:
- Histidine: Histidine has a pKa near physiological pH, so it can be positively charged, neutral, or negatively charged depending on the local environment.
- Lysine: Lysine is positively charged at physiological pH due to its amino group that can easily accept a proton.
- Asparagine: Asparagine is neutral at physiological pH as it does not have a charged side chain.
Glutamic acid has a net negative charge at physiologic pH (~7.4) because it possesses a carboxyl group (COOH) that can easily lose a proton, resulting in a negatively charged carboxylate group (COO-).
Explanation:
- Glutamic acid is an amino acid that contains a side chain with a carboxyl group.
- At physiological pH (~7.4), the carboxyl group of glutamic acid will lose a proton, resulting in a negatively charged carboxylate group.
- This negative charge gives glutamic acid a net negative charge at neutral pH.
Other options:
- Histidine: Histidine has a pKa near physiological pH, so it can be positively charged, neutral, or negatively charged depending on the local environment.
- Lysine: Lysine is positively charged at physiological pH due to its amino group that can easily accept a proton.
- Asparagine: Asparagine is neutral at physiological pH as it does not have a charged side chain.
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