This section consists of passages followed by multiple choice questions. Usually there are nine passages, ech half a page long with questions pertaining to the passage following it. The total number of questions in this sectionis 65, which comes down to about 7 questions per passage on average.
Some questions are factual questions that stand on their own.
Other questions test your ability to discern the scientific issues related to a problem. You are given a passage that describes some biological or chemical concept or problem and it is followed by questions. Many questions are not of the type you've seen on your exams. They require problem-solving and integration of more than one concept. Test you on skills and understanding you would need to do actual experiments such as purifications, isolations, etc.