The test consists of approximately 200 multiple-choice questions. Many of which are grouped in sets toward the end of the test. They are generally based on descriptions of laboratory and field situations, diagrams or experimental results.
The content of the test is structured into three major areas: cellular and molecular biology, organismal biology and ecology and evolution. Approximately equivalent significance is given to each of these three areas. In addition to the total score, a sub score in each of these areas is reported.
The approximate distribution of questions by content category is shown below.
I. CELLULAR AND MOLECULAR BIOLOGY (33–34%)
II. ORGANISMAL BIOLOGY (33–34%)
III. ECOLOGY AND EVOLUTION (33–34%)
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