LIFE SCIENCE

Detailed explanation-1: -Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. Proteins are assembled at organelles called ribosomes.

Detailed explanation-2: -Proteins are fed into the ER during translation if they have an amino sequence called a signal peptide. In general, proteins bound for organelles in the endomembrane system (such as the ER, Golgi apparatus, and lysosome) or for the exterior of the cell must enter the ER at this stage.

Detailed explanation-3: -The correct option is C. Cytoplasm. The endoplasmic reticulum is an irregular network of fine tubular structure that extends throughout the cytoplasm of the cell. Cytoplasm is enclosed by the cell membrane.

Detailed explanation-4: -The Golgi apparatus transports and modifies proteins in eukaryotic cells.

Detailed explanation-5: -The endoplasmic reticulum is a network of double-membrane tubular canals running throughout the cytoplasm . It is continuous with the nuclear membrane.