Amino acids and protein structure Quiz
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5 questions, one answer each
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1. Which bond is a covalent bond between the R groups of two cysteine molecules?
- A. Hydrogen bond
- B. Ionic bond
- C. Peptide bond
- D. Disulfide bridge
2. What is the colour of a positive biuret test?
- A. Brick-red
- B. Blue-black
- C. Purple
- D. Cloudy white
3. A polypeptide has 80 amino acids. How many peptide bonds does it contain?
- A. 80
- B. 79
- C. 81
- D. 160
4. Which level of structure is determined by hydrogen bonds between peptide groups?
- A. Primary
- B. Tertiary
- C. Quaternary
- D. Secondary
5. Which statement about quaternary structure is correct?
- A. It is the sequence of amino acids
- B. It is the association of two or more polypeptides
- C. It is the α-helix
- D. All proteins have it