No, it's a feature found only on the practice tests. The PTs tell you this themselves during the tutorial. God only knows why AAMC thought it was a good idea to put that feature in the PTs, it can only serve to screw people up who aren't aware that that feature won't be on the real thing. Obviously you should never use it; just pretend it isn't there.
For the record, here are the other differences between the real thing and the practice exams:
- Ctrl+V, Ctrl+C, and Ctrl+X do not work on the writing section on the real exam.
- Right click does not work on the real exam.
- Mouse wheels do not scroll the question frame for you on the real exam, although inexplicably the mouse wheel does still scroll the passage text for you.
- Strike-outs do not show up correctly for questions with figures or equations in them on the real exam. It just ends up putting a negative sign to the left of the figure/equation which is obviously a big problem.
- There is an additional time warning on the real exam that pops up when you have 5 minutes left on a section.
- The resolution and aspect ratio on the monitors in the test center are very likely lower than what you're used to at home. The consequence of this is that passages and question stems seem longer than they really are. Don't be intimidated when you see this.
- The lower left hand corner lists your position in the test by passage, not by question # (so it'll say "Passage 6 of 7" rather than "Questions 44-49").
- After the tutorial section at the start of the test there is an additional 10 minute section where you agree or disagree to the testing conditions.
- There is a survey at the end of the real exam.
- There is a bug in the real exam that causes it to not give you your score immediately after you finish but instead makes you wait 30 days to get it back.