Proteins Quiz
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5 questions, one answer each
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1. A tetrapeptide is made from four amino acids. How many peptide links does it contain?
- A. 2
- B. 3
- C. 4
- D. 5
2. Which interaction holds an α-helix in shape?
- A. S–S bonds between cysteine residues
- B. Hydrogen bonds between N–H and C=O of peptide links
- C. Ionic bonds between chains
- D. Covalent bonds between side chains
3. A spot moves 4.2 cm and the solvent front moves 7.0 cm. What is the Rf value?
- A. 0.60
- B. 0.67
- C. 1.67
- D. 2.8
4. Which structure involves S–S bonds?
- A. Primary
- B. Secondary
- C. Tertiary
- D. None of these
5. What are the products of complete hydrolysis of the dipeptide H₂NCH₂CONHCH(CH₃)COOH?
- A. Glycine and alanine
- B. Two molecules of glycine
- C. Glycine and ethanoic acid
- D. Ammonia and propanoic acid