Which type of ER is well developed in lipid synthesizing and protein synthesizing cells?

Explanation

To answer the question regarding which type of endoplasmic reticulum (ER) is well developed in lipid synthesizing and protein synthesizing cells, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding Endoplasmic Reticulum (ER)**:
- The endoplasmic reticulum is an organelle found in eukaryotic cells and is involved in the synthesis and processing of proteins and lipids.

2. **Types of Endoplasmic Reticulum**:
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