Multiple Choice
Which of the following best describes the type of molecule tryptophan is?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
Which component of an amino acid is primarily responsible for its unique chemical properties?
A
The carboxyl group (\(-COOH\))
B
The amino group (\(-NH_2\))
C
The side chain (R group)
D
The central (alpha) carbon
Verified step by step guidance1
Understand the structure of an amino acid: Amino acids consist of a central (alpha) carbon atom bonded to four groups: a carboxyl group (
), an amino group (
), a hydrogen atom, and a variable side chain (R group).
Recognize the role of the carboxyl group (
): This group contributes to the acidic properties of the amino acid but does not determine its unique chemical properties.
Understand the function of the amino group (
): This group contributes to the basic properties of the amino acid but also does not define its uniqueness.
Focus on the side chain (R group): The R group is the variable component of an amino acid and is primarily responsible for its unique chemical properties. It can range from a simple hydrogen atom (as in glycine) to complex structures (as in tryptophan). The R group determines the amino acid's polarity, charge, and reactivity.
Conclude with the central (alpha) carbon: While the central carbon is a structural component that connects the other groups, it does not contribute to the unique chemical properties of the amino acid. The R group is the key determinant.
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