The ER extends from the outer surface of the nuclear membrane into the cell body. Rough ER is a host for ribosomes that continually attach to and detach from the ER surface. The rough ERâs main function is to help form and store proteins, while smooth ERs store lipids, a type of fat. Many of the proteins created by attached ribosomes pass into the rough ER and then travel to other parts of the body. The Ribosome
Best Answer: AP is advanced placement. They are advanced (or honors, if you will) classes that high school students can take while in high school. These classes end with an AP test that tests the students on what they learned in the class. In my experience, the AP test did not count in the final grade of the class.
The SAT is the real test. The PSAT (preliminary scholastic aptitude test) is like a practice test but its score is important. It indicates how well you are prepared for the SAT and where you need more study. Many students take the PSAT more than once. If so you need to inquire if your official score is the last one or the highest one.