4. (5 points) Using a few words and/or a simple diagram, explain how the Rad50 protein may facilitate the holding together of broken DNA molecules.
Again, I'm going to "cheat" by using a diagram from our web site:
The diagram shows a tetramer of Rad50 molecules (plus Mre11 molecules), which are binding to DNA molecules with their ATPase + Mre11 domains and interacting with each other via their Zn-hook domains. I felt that a complete answer included mention of the Zn-hook domains, which are important for holding the two DNA molecules together. The Zn-hook domains could either be included in your illustration or mentioned in your accompanying words.
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