Official MCAT guide, question about red blood cells

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One of the questions in the official mcat guide (#2, passage 2 of BIO) asks for the cellular location of a plasma membrane protein after its release from the ribosome. I know the general path for secretion is rough ER-->golgi-->plasma membrane..BUT if the GBA is in the plasma membrane of red blood cells, then don't red blood cells lack organelles. So how do red blood cells have plasma membrane proteins?

 

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One of the questions in the official mcat guide (#2, passage 2 of BIO) asks for the cellular location of a plasma membrane protein after its release from the ribosome. I know the general path for secretion is rough ER-->golgi-->plasma membrane..BUT if the GBA is in the plasma membrane of red blood cells, then don't red blood cells lack organelles. So how do red blood cells have plasma membrane proteins?

Red cell precursors do have organelles, do a bunch of stuff during development, and then lose these organelles as they become a mature red blood cell