Critical Thinking Activities - Chapter 18 Answers

  1. Not active: the pH optimum of pepsin is 2 (571).

  2. It should be about 5 (the answer should be evident from what the author says on 571).

  3. It contains lymphatic nodules that will help in the immune response (577, 579).

  4. The penicillin may kill the bacteria in the large intestine. These bacteria are important to us because, among other things, they produce large amounts of vitamin K (577).

  5. Polypeptides are broken down into their component amino acids by the digestive processes (594).

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