The textbook for the course is the third edition of Biochemistry by Mathews, van Holde, and Ahern.
Students sometimes have a great deal of confusion about exam policy.
Your grade will be determined in that case by averaging your two remaining exam scores. Sometimes students interpret the above policy to mean that they can drop one exam. Many students wonder what constitutes unusual circumstances. Airline tickets to somewhere else. You misread the date of the exam on the syllabus.