Question

if the endoplasmic reticulum were removed from the cell, which organelle would not be able to function properly, and why? mitochondria, because they rely on the er as an energy source ribosomes, because they receive proteins made by the er golgi apparatus, because it packages proteins received from the er cytoplasm, because it relies on the er for structural support

Explanation:

The endoplasmic reticulum (ER) is involved in protein synthesis and transport. The Golgi apparatus modifies, sorts, and packages proteins that come from the ER. Mitochondria produce energy (ATP) through cellular respiration and do not rely on the ER as an energy source. Ribosomes are the sites of protein synthesis (not the ER making proteins for them in the way described in the option). The cytoplasm has its own structural support mechanisms (cytoskeleton) and does not primarily rely on the ER for structural support.

Answer:

Golgi apparatus, because it packages proteins received from the ER.