Question

which option describes one of the main functions of the endoplasmic reticulum?
housing genetic information
transport of proteins
cellular movement

Explanation:

• "Housing genetic information" is a function of the nucleus, not the endoplasmic reticulum (ER).
• The endoplasmic reticulum (both rough and smooth) is involved in the synthesis, folding, and transport of proteins (rough ER has ribosomes for protein synthesis, and both types help in transporting proteins to other parts of the cell or for secretion).
• "Cellular movement" is related to structures like the cytoskeleton, cilia, or flagella, not the ER. So the correct option is the one about transport of proteins.

Answer:

B. transport of proteins (assuming the options are labeled as A, B, C with A: housing genetic information, B: transport of proteins, C: cellular movement)