Proteins Quiz
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5 questions, one answer each
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1. Which feature of an amino acid differs between the 20 different amino acids?
- A. Amino group
- B. Carboxyl group
- C. R group
- D. Central carbon
2. Which bond is a strong covalent bond that forms between R groups?
- A. Hydrogen bond
- B. Ionic bond
- C. Disulfide bond
- D. Peptide bond
3. Which level of structure is the sequence of amino acids?
- A. Primary
- B. Secondary
- C. Tertiary
- D. Quaternary
4. Why is collagen strong?
- A. It is soluble
- B. It has an irregular sequence
- C. Three chains in a triple helix with cross-links
- D. It contains haem groups
5. A student says haemoglobin has quaternary structure but a single enzyme chain does not. Which is the best justification?
- A. Haemoglobin is larger than an enzyme
- B. Haemoglobin has four polypeptide chains associated together
- C. Haemoglobin has no tertiary structure
- D. Enzymes have no R groups