To get a more specific idea of what students will experience when completing the PA Biology Keystone Exam, please refer to the information linked below.
The Keystone Exam page from the Pennsylvania Department of Education provides comprehensive information about all three Keystone Exams.
This test design document provides general information about the broad topics covered on the exam and the number of questions on each part of the Keystone exam.
These are sample Keystone Biology questions made available from the Pennsylvania Department of Education. When prompted on the screen select "Item Samplers" and then "Biology".
Also know that those of us who teach courses that conclude with a Keystone Exam may not read or look over the exam when students complete them. Likewise, the Keystone Exams are graded by PDE.