Cell Structure and Function

What is the function of histones in relation to DNA?

• Replicating DNA
• Transcribing DNA
• Repairing DNA
• Packaging DNA into chromatin

What type of bond is primarily responsible for the secondary structure of proteins?

• Ionic bond
• Disulfide bond
• Hydrophobic interaction
• Hydrogen bond

Which amino acid is optically inactive?

• Alanine
• Cysteine
• Threonine
• Glycine

What is the charge of an amino acid at its isoelectric point?

• Positive
• Negative
• Variable
• Neutral

Which of the following amino acids has a hydroxyl (-OH) group in its side chain?

• Alanine
• Valine
• Phenylalanine
• Serine