Podcast
Questions and Answers
Which type of R group is histidine classified as based on its charge at pH 7?
Which type of R group is histidine classified as based on its charge at pH 7?
In an amino acid with a predominantly negatively charged R group, at what pH would it carry a net zero charge?
In an amino acid with a predominantly negatively charged R group, at what pH would it carry a net zero charge?
When glycine moves toward a positive electrode, what is its likely charge?
When glycine moves toward a positive electrode, what is its likely charge?
Which R group is cysteine classified as based on its ability to form disulfide bonds?
Which R group is cysteine classified as based on its ability to form disulfide bonds?
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At what pH would an amino acid with an aromatic R group carry a net zero charge?
At what pH would an amino acid with an aromatic R group carry a net zero charge?
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What type of R group would typically have a net positive charge at pH 7?
What type of R group would typically have a net positive charge at pH 7?
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Study Notes
### Histidine's R Group Charge at pH 7
- Histidine is classified as a positively charged or basic R group at pH 7
Negatively Charged R Group at Net Zero Charge
- An amino acid with a predominantly negatively charged R group would carry a net zero charge at its isoelectric point, which is typically near the pKa of the carboxyl group in the side chain.
Glycine's Charge When Moving Towards Positive Electrode
- Glycine is zwitterionic at neutral pH, meaning it has a positive charge on the amino group and a negative charge on the carboxyl group. When glycine moves towards a positive electrode, it indicates a net positive charge.
Cysteine's R Group Classification
- Cysteine is classified as a polar, uncharged R group due to its sulfhydryl group (-SH), which can form disulfide bonds with another cysteine residue.
Aromatic R Group at Net Zero Charge
- An amino acid with an aromatic R group would carry a net zero charge at its isoelectric point, which is specific to each amino acid and dependent on the pKa values of its ionizable groups.
Positively Charged R Group at pH 7
- An R group typically carries a net positive charge at pH 7 if it has basic side chains like lysine and arginine, which are protonated at physiological pH.
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Description
Test your knowledge on the key features of polar, uncharged R groups, the importance of cysteine in forming disulfide bonds, and characteristics of aromatic R groups. Learn about their properties and interactions.
