Amino acids and protein structure Quiz
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5 questions, one answer each
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1. Which bond joins two amino acids in a dipeptide?
- A. Hydrogen bond
- B. Peptide bond
- C. Ionic bond
- D. Disulfide bridge
2. What is released when a peptide bond forms?
- A. Carbon dioxide
- B. Oxygen
- C. Water
- D. Hydrogen
3. Which bond is a strong covalent bond between two cysteine R groups?
- A. Disulfide bridge
- B. Hydrogen bond
- C. Ionic bond
- D. Hydrophobic interaction
4. Why is haemoglobin soluble in the cytoplasm of a red blood cell?
- A. It has hydrophobic R groups on the outside
- B. It is made of one polypeptide
- C. Its hydrophilic R groups are on the outside
- D. It contains iron
5. Why does collagen have high tensile strength?
- A. It has a haem group in each chain
- B. It is soluble in water
- C. It is made of one alpha-helix
- D. Its three chains are in a triple helix, held by hydrogen bonds and covalent cross-links