B1.2 Proteins Quiz
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5 questions, one answer each
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1. A polypeptide of 100 amino acids is made by condensation. How many water molecules are released?
- A. 100
- B. 99
- C. 101
- D. 50
2. Which statement about essential amino acids is correct?
- A. They can be made from other amino acids
- B. They must be obtained from food
- C. They are found only in meat
- D. They are not needed by adults
3. How many different sequences are possible for a chain of 3 amino acids?
- A. 60
- B. 400
- C. 8000
- D. 23
4. What happens to a protein when it is denatured?
- A. Its peptide bonds are hydrolysed
- B. Its three-dimensional shape changes
- C. Its R-groups are removed
- D. It becomes an amino acid
5. Pepsin works at pH 2 but is inactive at pH 8. Why?
- A. It is hydrolysed into amino acids
- B. The change in charges alters its shape
- C. It needs more water
- D. Its amine groups are removed