What does the nucleus hold inside of it? Spindle fibers DNA Centrioles Chlorophyll

## Step 1
The nucleus is a membrane-bound organelle found in eukaryotic cells. It is often referred to as the "control center" of the cell because it houses the cell's genetic material.
## Step 2
The genetic material housed in the nucleus is DNA (deoxyribonucleic acid). DNA contains the instructions needed for the development and functioning of the organism.
## Step 3
Spindle fibers are involved in cell division and are not housed within the nucleus. They are structures that help separate chromosomes during cell division.
## Step 4
Centrioles are also involved in cell division and are not housed within the nucleus. They are structures that help organize the assembly of microtubules during cell division.
## Step 5
Chlorophyll is a pigment found in plants and some algae that is involved in photosynthesis. It is not housed within the nucleus.