EVERYDAY SCIENCE

Detailed explanation-1: -The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins. Sometimes, when those proteins are made improperly, the proteins stay within the endoplasmic reticulum.

Detailed explanation-2: -The ribosome that is synthesizing the protein is directly attached to the ER membrane. These membrane-bound ribosomes coat the surface of the ER, creating regions termed rough endoplasmic reticulum, or rough ER (Figure 12-36A).

Detailed explanation-3: -ROUGH ENDOPLASMIC RETICULUM These are called membrane bound ribosomes and are firmly attached to the outer cytosolic side of the ER About 13 million ribosomes are present on the RER in the average liver cell.

Detailed explanation-4: -Explanation for correct option: Option A: Ribosomes: The rough endoplasmic reticulum has ribosomes attached to it. The endoplasmic reticulum is a double-membrane-bound organelle within a cell.

Detailed explanation-5: -It primarily has a catalytic function and it binds with the aminoacylated tRNAs. These ribosomes constantly attach and detach from the endoplasmic reticulum as they are not a part of a stable organelle. They attach when the ribosome begins to synthesize proteins that are going to be secreted.