Question

part e: onion cells

1. what is the shape of the onion cells?
2. what is the purpose of the nucleus?
3. what is the name of the outer rim of the nucleus that separates it from the cytoplasm?
4. describe where the nucleolus is located.
5. what does the nucleolus do?

Explanation:

1. Onion cells are typically rectangular or elongated in shape. This is due to the presence of a rigid cell wall that provides structural support.
2. The nucleus is the control center of the cell. It contains the cell's genetic material (DNA) and is responsible for regulating gene expression, cell growth, metabolism, and reproduction.
3. The outer rim of the nucleus that separates it from the cytoplasm is called the nuclear membrane or nuclear envelope. It is a double - membrane structure with nuclear pores that allow the passage of molecules in and out of the nucleus.
4. The nucleolus is located within the nucleus. It is a dense, spherical - shaped structure.
5. The main function of the nucleolus is to produce ribosomal RNA (rRNA) and assemble ribosomal subunits. These ribosomal subunits are then transported out of the nucleus to the cytoplasm where they combine to form functional ribosomes, which are essential for protein synthesis.

Answer:

1. Rectangular (or elongated).
2. Control center of the cell; contains DNA and regulates cell activities.
3. Nuclear membrane (or nuclear envelope).
4. Within the nucleus.
5. Produces rRNA and assembles ribosomal subunits.