Quiz for Proteins

Q1: Which amino acid contains a thiol group?

A. Glycine B. Cysteine C. Alanine D. Serine

Q2: Which bond is responsible for maintaining the primary structure of proteins?

A. Hydrogen bond B. Ionic bond C. Peptide bond D. Disulfide bond

Q3: Denaturation of proteins leads to loss of which structure?

A. Primary B. Secondary and tertiary C. Only secondary D. Only tertiary

Q4: Which of the following is not an essential amino acid?

A. Valine B. Lysine C. Glycine D. Leucine

Q5: Which test is used to detect the presence of proteins?

A. Tollen’s test B. Benedict’s test C. Biuret test D. Fehling’s test

Q6: What type of protein is hemoglobin?

A. Structural protein B. Enzyme C. Hormone D. Transport protein

Q7: Alpha-helix is a feature of which protein structure?

A. Primary B. Secondary C. Tertiary D. Quaternary

Q8: Which interaction stabilizes the tertiary structure of proteins?

A. Hydrogen bond B. Disulfide bridge C. Hydrophobic interaction D. All of these

Q9: Enzymes are biologically active:

A. Lipids B. Carbohydrates C. Proteins D. Vitamins

Q10: Which level of protein structure involves two or more polypeptide chains?

A. Primary B. Secondary C. Tertiary D. Quaternary

Q11: Zwitterion form of amino acids exists at:

A. Low pH B. High pH C. Isoelectric point D. All pH

Q12: Proteins are made up of:

A. Nucleotides B. Monosaccharides C. Fatty acids D. Amino acids

Q13: Which of these is not a function of proteins?

A. Catalysis B. Transport C. Structural support D. Energy storage like fats

Q14: Which amino acid is aromatic?

A. Leucine B. Valine C. Phenylalanine D. Glycine

Q15: The sequence of amino acids in a protein is called its:

A. Primary structure B. Secondary structure C. Tertiary structure D. Quaternary structure

Q16: Which of the following proteins is water-insoluble?

A. Albumin B. Globulin C. Keratin D. Hemoglobin

Q17: Enzymes speed up reactions by:

A. Decreasing temperature B. Increasing activation energy C. Lowering activation energy D. Increasing pressure

Q18: Disulfide bonds in proteins form between:

A. Cysteine residues B. Lysine residues C. Glycine residues D. Arginine residues

Q19: Which of the following is a conjugated protein?

A. Albumin B. Hemoglobin C. Keratin D. Insulin