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Which of the following is NOT a characteristic of the peptide bond linking amino acids in proteins?
Partial double bond character
Planar structure
Free rotation around the C-N bond
Trans configuration
A novel protein was discovered containing a unique amino acid with a side chain composed of a selenol group (-SeH). Compared to a cysteine residue (-SH) in a similar protein, this selenol-containing amino acid would MOST likely exhibit which property?
Increased reactivity towards oxidizing agents
Decreased reactivity towards oxidizing agents
Identical reactivity towards oxidizing agents
Formation of stronger disulfide bonds
Which amino acid substitution in a protein is MOST likely to disrupt a beta-sheet structure due to steric hindrance?
Glycine to Valine
Alanine to Glycine
Valine to Isoleucine
Serine to Threonine
A protein rich in proline residues is likely to exhibit which characteristic?
Formation of extensive alpha-helices
Increased tendency to form beta-sheets
Disruption of regular secondary structure (e.g., alpha-helices and beta-sheets)
Enhanced protein stability at high temperatures
The isoelectric point (pI) of a polypeptide with a high content of lysine and arginine residues would be expected to be:
Acidic
Neutral
Basic
Close to 7
Which type of bond links monomers to form a protein?
Glycosidic bond
Peptide bond
Phosphodiester bond
Hydrogen bond
Which of these is responsible for the primary structure of a protein?
Hydrogen bonds between amino acids
Disulfide bonds between amino acids
Peptide bonds between amino acids
Ionic bonds between amino acids
In proteins, amino acids are linked together by:
Glycosidic linkages
Peptide bonds
Hydrogen bonds
Ester linkages
Which bond is responsible for the primary structure of a protein?
Hydrogen bond
Disulfide bond
Peptide bond
Ionic bond
The hydrolysis of which bond would yield a mixture of amino acids?
Glycosidic bond
Ester bond
Peptide bond
Hydrogen bond