Which amino acids have electrically charged side chains at pH levels typical of living cells?
Understand the Problem
The question asks to identify which amino acids possess electrically charged side chains at physiological pH (around pH 7.4), which is the typical pH found in living cells. This involves knowing the structure and properties of amino acid side chains, particularly their ionizable groups (acids and bases) and how they behave at a given pH.
Answer
Aspartic acid, glutamic acid, arginine, lysine, and histidine have electrically charged side chains at typical pH levels in living cells.
The amino acids with electrically charged side chains at pH levels typical of living cells are:
- Aspartic acid (Asp)
- Glutamic acid (Glu)
- Arginine (Arg)
- Lysine (Lys)
- Histidine (His)
Answer for screen readers
The amino acids with electrically charged side chains at pH levels typical of living cells are:
- Aspartic acid (Asp)
- Glutamic acid (Glu)
- Arginine (Arg)
- Lysine (Lys)
- Histidine (His)
More Information
At physiological pH, aspartic acid and glutamic acid are negatively charged, while arginine, lysine, and histidine are positively charged.
Tips
It is important to remember the specific amino acids that fall into each category (acidic/negatively charged and basic/positively charged) at physiological pH.
Sources
- Amino Acids Reference Chart - Sigma-Aldrich - sigmaaldrich.com
- Amino acid - Wikipedia - en.wikipedia.org
- life11e_ch03 - digfir-published.macmillanusa.com
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