CustomExam Practice Test - 25/01/2026
A practice test for CustomExam
8Questions
16Minutes
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About This Test
This practice test is designed to help you prepare for the CustomExam exam. It contains 8 questions and has a time limit of 16 minutes.
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Important Questions
1
What are non-polar (hydrophobic) amino acids?
A:Amino acids with hydrophilic side chains
B:Amino acids with charged side chains
C:Amino acids with hydrophobic side chains
D:Amino acids with polar side chains
2
What is the primary structure of a protein?
A:The sequence of amino acids in a protein, linked by peptide bonds, forming a polypeptide chain
B:The folding or twisting of the polypeptide chain into α-helices or β-pleated sheets
C:The arrangement and interaction of multiple polypeptide subunits in a protein
D:The pH at which an amino acid carries no net charge
3
What stabilizes the secondary structure of proteins?
A:Hydrogen bonds, hydrophobic interactions, Van der Waals forces, disulfide bonds, and ionic bonds
B:Peptide bonds, hydrophobic interactions, Van der Waals forces, disulfide bonds, and ionic bonds
C:Hydrogen bonds, hydrophilic interactions, Van der Waals forces, disulfide bonds, and ionic bonds
D:Hydrogen bonds, hydrophobic interactions, Van der Waals forces, covalent bonds, and ionic bonds
4
What is the quaternary structure of proteins?
A:The sequence of amino acids in a protein, linked by peptide bonds, forming a polypeptide chain
B:The folding or twisting of the polypeptide chain into α-helices or β-pleated sheets
C:The arrangement and interaction of multiple polypeptide subunits in a protein
D:The pH at which an amino acid carries no net charge
5
What is the significance of the isoelectric point (pI) of amino acids?
A:Affects the solubility and mobility of amino acids in an electric field
B:Determines the folding of the polypeptide chain
C:Stabilizes the tertiary structure of proteins
D:Determines the chemical reactivity of amino acids
6
What are amino acids?
A:Small units of proteins
B:Types of enzymes
C:Building blocks of DNA
D:Components of cell membranes
7
What group does an L-α-amino acid have attached to the α-carbon?
A:Amino group, carboxylic acid group, hydrogen atom, and a variable side chain (R-group)
B:Hydroxyl group, carboxylic acid group, phosphate group, and a variable side chain (R-group)
C:Amino group, phosphate group, sulfur group, and a variable side chain (R-group)
D:Amino group, carboxylic acid group, sulfur group, and a variable side chain (R-group)
8
How are amino acids classified based on their side chains?
A:Aliphatic, hydroxy, imino, aromatic, and diamino acids
B:Aliphatic, hydroxy, sulfur-containing, dicarboxylic acid and their amides, and diamino acids
C:Aliphatic, hydroxy, sulfur-containing, imino acids, and charged acids
D:Aliphatic, hydroxy, sulfur-containing, dicarboxylic acid and their amides, and diamino acids