Multiple Choice
Which of the following formulas contains protein that has been broken down into its building blocks (free amino acids)?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
Which set of words best describes the side chain of the amino acid threonine?
A
Polar, uncharged, contains a hydroxyl group
B
Nonpolar, hydrophobic, contains a methyl group
C
Positively charged, basic, contains an amine group
D
Negatively charged, acidic, contains a carboxyl group
Verified step by step guidance1
Step 1: Recall the structure of threonine. Threonine is an amino acid with a side chain containing a hydroxyl (-OH) group attached to a carbon atom.
Step 2: Understand the chemical properties of the hydroxyl group. The hydroxyl group is polar because of the electronegativity difference between oxygen and hydrogen, making the side chain hydrophilic.
Step 3: Note that threonine's side chain is uncharged at physiological pH. The hydroxyl group does not gain or lose protons under normal biological conditions, so it remains neutral.
Step 4: Compare the descriptions provided in the options. The correct description should match the chemical properties of threonine's side chain: polar, uncharged, and contains a hydroxyl group.
Step 5: Eliminate the other options based on their inaccuracies. For example, threonine's side chain is not nonpolar or hydrophobic, does not contain a methyl group, is not positively charged or basic, and does not contain a carboxyl group.
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