relation to protein production and packaging in a eukaryotic cell, which step occurs first?
A. The ER membrane pinches off to encircle the protein.
B. In the nucleus DNA instructions are copied as RNA messages.
C. Proteins cross the membrane of the rough ER and enter the ER.
D. The vesicle holding the protein travels through the endoplasmic reticulum and out into the cytoplasm.

The answer would be b. in the nucleus DNA instructions are copied as RNA messages. This is called translation. The RNA then takes that information to the ribosome where it is transcribed into amino acids, which will form a polypeptide chain and create a protein

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.