Which of the characteristics of collagen structure listed below contribute to the tensile strength of collagen? I. Collagen is made up of a triple helix where 3 left-handed helices twist together in a right-handed sense. II. Collagen includes a repeating sequence of amino acids with glycine every 3 amino acids in a helix with about 3 amino acids per turn. III. The three left-handed helices are staggered to allow close packing between glycine residues and rigidity from the bulky and inflexible proline/hydroxyproline.

1. I
2. I and II
3. I, II, and III
4. II and III
5. I and III

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