Question

what do smooth endoplasmic reticulum not have attached that rough endoplasmic reticulum?
ribosomes
blue beedy strings
vacuoles

Explanation:

The rough endoplasmic reticulum (RER) has ribosomes attached to its surface, which gives it a "rough" appearance. The smooth endoplasmic reticulum (SER) does not have ribosomes attached, which is why it is called "smooth". Vacuoles are membrane - bound organelles for storage. "Blue beedy strings" is not a biological term related to the endoplasmic reticulum.

Answer:

ribosomes