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| Modern Genetic Analysis Chapter 3. Gene Function Protein Structure Figure 3-16. Different levels of protein structure. (a) Primary structure. (b) Secondary structure. The polypeptide shown in part a is drawn into an a helix by hydrogen bonds. (c) Tertiary structure: the three-dimensional structure of myoglobin. (d) Quaternary structure: the arrangement of two a subunits and two b subunits to form the complete quaternary structure of hemoglobin.

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