Podcast
Questions and Answers
Which amino acid is classified as having a polar side chain with a sulfhydryl group?
Which amino acid is classified as having a polar side chain with a sulfhydryl group?
- Phenylalanine
- Leucine
- Threonine
- Cysteine (correct)
Which group of amino acids has positively charged radicals?
Which group of amino acids has positively charged radicals?
- Aspartic acid, proline, tyrosine
- Glycine, methionine, serine
- Lysine, arginine, histidine (correct)
- Phenylalanine, arginine, glutamine
Which of the following amino acids is NOT classified as having a non-polar side chain?
Which of the following amino acids is NOT classified as having a non-polar side chain?
- Proline
- Alanine
- Isoleucine
- Asparagine (correct)
Which amino acids belong to the category of polar amino acids with uncharged side chains?
Which amino acids belong to the category of polar amino acids with uncharged side chains?
What is the classification of glutamic acid in terms of its polarity and side chain?
What is the classification of glutamic acid in terms of its polarity and side chain?
Flashcards
Non-polar amino acids
Non-polar amino acids
Amino acids with R groups that are non-polar and do not interact with water.
Polar amino acids
Polar amino acids
Amino acids with R groups that are polar and can interact with water.
Uncharged polar amino acids
Uncharged polar amino acids
Polar amino acids with uncharged R groups that can still form hydrogen bonds with water.
Charged polar amino acids
Charged polar amino acids
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Amino acid polarity classification
Amino acid polarity classification
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Study Notes
Amino Acid Classification
- Amino acids are categorized based on the polarity of their side chains (R groups) at a physiological pH of ~7.4.
Non-Polar Amino Acids
- These amino acids have non-polar side chains.
- Examples include: Glycine, alanine, valine, leucine, isoleucine, methionine, proline, phenylalanine, and tryptophan.
Polar Amino Acids (Uncharged)
- These amino acids have polar but uncharged side chains.
- Sulfhydryl side chains: Cysteine
- Hydroxyl side chains: Serine, threonine, and tyrosine
- Amide containing side chains: Asparagine and glutamine
Polar Amino Acids (Charged)
- These amino acids have charged side chains.
- Negatively charged radicals: Aspartic acid and glutamic acid (acidic amino acids). These amino acids have a mono-amino and di-carboxylic structure.
- Positively charged radicals: Lysine, arginine, and histidine (basic amino acids). These amino acids have a di-amino and mono-carboxylic structure.
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Description
Test your knowledge on the classification of amino acids based on the polarity of their side chains. This quiz covers non-polar, polar uncharged, and polar charged amino acids along with examples for each category. Challenge yourself and see how well you understand the building blocks of proteins!
