As a biology student, you will frequently encounter alternative terminologies describing the same thing. So the question to us is which set of terminologies do you use? For example, when describing membrane proteins, we use the term intrinsic and extrinsic, or integral and peripheral. Between these two, I'll always ask my students to use the one that's easiest for them to remember, and the one which has the least amount of confusion. And in this case, my preference is integral and peripheral proteins, because in this describes proteins which are in the membrane, or on one side of it, rather than intrinsic and extrinsic proteins, which seem to connote either inside or outside the cell, rather than in the membrane of the cell. But do you need to follow my recommendations? I tell you not just whichever terms that you prefer, because that's the easiest to you.