Thank you to Jack Barbera and Regis Komperda for statistical guidance and to the anonymous reviewers for their constructive feedback. Thank you to Emily Cornelius and Mike Wendel for assistance with developing and facilitating the Principles of Biology CURE and to Yelisey Gurzhuy for additional help with qualitative data analysis. Finally, we are grateful for the Principles of Biology students who volunteered to participate in this study. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program (E.C.G.) and IOS-1354549 (J.E.P.). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.