NEET BIOLOGY

Detailed explanation-1: -Proteins are assembled at organelles called ribosomes. When proteins are destined to be part of the cell membrane or exported from the cell, the ribosomes assembling them attach to the endoplasmic reticulum, giving it a rough appearance.

Detailed explanation-2: -Rough endoplasmic reticulum appears rough, if viewed under a microscope. It is so because of the presence of ribosomes on its surface. Ribosomes are yet another cell organelle that help in the synthesis of proteins.

Detailed explanation-3: -Rough endoplasmic reticulum is an organelle found in eukaryotic cells. Its main function is to produce proteins. It is made up of cisternae, tubules and vesicles. The cisternae are made up of flattened membrane disks, which are involved in the modification of proteins.