Feedback for Multiple Choice Quiz 1

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  1. Molecular oxygen was not present until the evolution of photosynthetic organisms. Thus, the early prebiotic atmosphere was a reducing environment.

  2. Verify the correct answer by looking at Table 1.1, p. 4 in Campbell or the Lecture 1 handout.

  3. This is a direct quote from p. 3 of Campbell. In biochemistry, "reactive groups" and "functional groups" are nearly synonyms.

  4. Guanidinium is found in Arginine, Indole in Tryptophan, and Imidazole in Histidine.

  5. The math is:
    10 x ln10 = 10 x 2.3 = 23.