Besides packaging secretory proteins into transport vesicles, what is another major function of the rough er?

Another major function of the rough endoplasmic reticulum (ER) is that it separates the secretory proteins from proteins that are formed by free ribosomes and they remain in the cytosol.

Rough endoplasmic reticulum is a structure made up of highly convoluted blocked sacs. The rough endoplasmic reticulum is covered with membrane bound ribosomes.  It is the center where membrane is produced for the cell and it is associated with protein arrangement, protein production, and quality control. The rough endoplasmic reticulum functions with the membrane bound ribosomes by conveying polypeptides and amino acids from the cytosol into transport vesicles.

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hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.