This document is an examination paper for higher level biology containing instructions, section headings, and multiple choice questions regarding three studies on using stem cells to treat type 1 diabetes. The studies tested embryonic stem cells, umbilical cord stem cells, and compared their effectiveness to controls by measuring blood glucose and C-peptide levels in mice and human patients over time. Responses are to be written in the provided boxes. The maximum mark is 72 and students have 2 hours and 15 minutes to complete the exam.