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Example Questions
Example Question #1 : Identifying Specific Protein Structures
Which of the following structures is methionine?
Methionine is a non-polar amino acid. It is one of two amino acids that contain sulfur, the other is cysteine.
Example Question #91 : Identifying Biochemical Molecules
Name the given structure.
Isoleucine
Alanine
Valine
Leucine
Lysine
Leucine
Leucine is a non-polar amino acid with a R-group.
Example Question #3 : Identifying Specific Protein Structures
Which of the following is a polar amino acid?
The polarity of an amino acid is determined by the R-group. The electronegativity difference between oxygen and carbon creates a dipole with the partial positive being on carbon and the partial negative being on oxygen. The dipole makes the molecule polar.
Example Question #9 : Identifying Specific Protein Structures
Which of the following is a basic amino acid?
Bases, according to the Bronsted-Lowry definition, are substances that accept
Example Question #92 : Identifying Biochemical Molecules
Identify the given amino acid.
Aspartic acid
Glutamic acid
Glutamine
Glycine
Asparagine
Glutamine
Glutamine is one of two amino acids that are amides. The nitrogen bonded to a carbon-oxygen double bond makes it an amide.
Example Question #311 : Biochemistry
Describe the solubility of the given amino acids.
and
Both are equally soluble
Neither are soluble
<
Cannot be determined without knowing the temperature of the solution
<
<
Although tyrosine is hydrophobic, it is more soluble than phenylalanine. The only difference between the two amino acids is the hydroxyl group present on tyrosine. The hydroxyl is much more acidic than the hydrogen, and so it is more likely to ionize. The ability to ionize makes it more soluble (think electrolytes).
Example Question #41 : Identification By Structure
Identify the given amino acid.
Glutamic acid
Myristic acid
Asparagine
Alanine
Aspartic acid
Aspartic acid
Aspartic acid is an acidic amino acid, meaning it contains in its R-group. The R-group of aspartic acid is .
Example Question #42 : Identification By Structure
Identify the given structure.
Proline
Phenylalanine
Histidine
Tyrosine
Tryptophan
Phenylalanine
Phenylalanine is a non-polar amino acid. The structure of this amino acid is literally alanine with a phenyl group attached.
Example Question #13 : Identifying Specific Protein Structures
Which of the following structures is threonine?
Threonine is a polar uncharged amino acid with a R-group.
Example Question #43 : Identification By Structure
Identify the given structure.
Aspartic acid
Alanine
Arginine
Leucine
Lysine
Arginine
Arginine is a basic amino acid. The charge on the amine in the functional group makes this structure basic. While lysine is also a basic amino acid, it has a different R-group.
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