Question

1. identify the nucleus. on the electron microscopy photo, label the nucleus, nuclear envelope, and er. 2. apply concepts why is the nucleus called the cells \control center\? 3. you can see a structure like a maze of passageways. the endoplasmic reticulum (en doh plaz milk rih tik yuh lum), a er, is an organelle with a network of membranes that process many substances, including proteins and lipids. lipids are an important part of cell structure. they also store energy. ribosomes dot some parts of the er, while other ribosomes float in the cytoplasm. the er and its attached ribosomes make proteins for use in the cell.

Explanation:

1. The nucleus is the control - center of the cell. It contains the cell's genetic material (DNA) which controls all cellular activities such as growth, metabolism, and reproduction.
2. The nucleus is called the cell's "control center" because it directs all cellular functions. DNA in the nucleus holds the instructions for making proteins and other molecules that the cell needs to function, grow, and divide.

Answer:

1. On the photo, the nucleus is the large, dark - colored, round structure in the center of the cell. The nuclear envelope surrounds it, and the endoplasmic reticulum (ER) is the network of membranes around it.
2. The nucleus is called the cell's "control center" because it contains DNA which has the instructions for all cell activities.