AP BIOLOGY

Detailed explanation-1: -Ribosomes are mainly found bound to the endoplasmic reticulum and the nuclear envelope, as well as freely scattered throughout the cytoplasm, depending upon whether the cell is plant, animal, or bacteria.

Detailed explanation-2: -The endoplasmic reticulum (ER) is a network of membrane-enclosed tubules and sacs (cisternae) that extends from the nuclear membrane throughout the cytoplasm (Figure 9.1). The entire endoplasmic reticulum is enclosed by a continuous membrane and is the largest organelle of most eukaryotic cells.

Detailed explanation-3: -Ribosomes are present only in the cytoplasm.

Detailed explanation-4: -The endoplasmic reticulum is found in most eukaryotic cells and forms an interconnected network of flattened, membrane-enclosed sacs known as cisternae (in the RER), and tubular structures in the SER. The membranes of the ER are continuous with the outer nuclear membrane.

Detailed explanation-5: -The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins.