Question

1. smooth endoplasmic reticulum (ser) lacks _____, which gives it a “smooth” appearance.

Explanation:

The smooth endoplasmic reticulum (SER) is named for its smooth appearance, which is due to the absence of ribosomes on its surface. Ribosomes are small organelles that are involved in protein synthesis. When ribosomes are attached to the endoplasmic reticulum, it is called the rough endoplasmic reticulum (RER). The RER has a "rough" appearance because of the ribosomes. In contrast, the SER lacks these ribosomes, giving it a smooth look.

Answer:

ribosomes