Explore the cell nucleus in the science of biology on this site. Learn how this organelle is the control center of the cell, storing the DNA and hereditary information inside chromosomes.

What is the cell structure of a prokaryote? Check out these cells with unorganized nuclei featured.

Simple animation explains the function of chromosomes, genes, and DNA by letting you zoom into a cell nucleus for a closer look.

[Free Registration/Login may be required to access all resource tools.] During mitosis, the DNA in a nucleus must replicate. The copied DNA is divided into two genetically identical sets, so that after cytokinesis or cell division, each...

A crossword to help review the terms and definitions associated with organelles.

Brief description of all the organelles.

Can you identify the steps of mitosis in this video? The video shows the process of the nucleus of a eukaryotic cell dividing in real time. [0:19]

Short, but excellent description of nucleolus.

The characteristics, structure, and functions of the nucleolus are described.

Explains how DNA contains genetic material and how it is housed in chromosomes. This lesson is 2 of 5 in the series titled "DNA."

Explains how DNA contains genetic material and how it is housed in chromosomes. This lesson is 1 of 5 in the series titled "DNA."

Explains how DNA contains genetic material and how it is housed in chromosomes. This lesson is 4 of 5 in the series titled "DNA."

See how our DNA is tightly packed up so that six feet of this long molecule fits into the microscopic nucleus of every cell. [1:30]

Learn about the structure of a typical plant cell with this informative diagram. The diagram lists important parts such as the nucleus, cytoplasm, leukoplast, cell wall, chloroplast and ribosomes.

Discover the organelles of a cell, and how their structure contributes to the cell's function.

Bacteria are single celled microbes. The cell structure is simpler than that of other organisms as there is no nucleus or membrane bound organelles. Instead their control centre containing the genetic information is contained in a single...

[Free Registration/Login may be required to access all resource tools.] For many years, archaea were classified as bacteria. Like the bacteria, archaea lacked a nucleus and membrane-bound organelles and, therefore, were prokaryotic...

[Free Registration/Login may be required to access all resource tools.] Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most protists are single-celled. Other than these features, they...

Describes the structure and functions of the membrane surrounding a cell nucleus.

Make sure you know your facts before playing this game! Concepts of cellular respiration are the focal point of the questions. Get them correct and hit the target, or get them wrong and your arrow will flop.

Wikipedia offers brief but accurate information on cytoplasm, the matter contained within the plasma membrane of a cell.

Explore the convept that DNA and proteins are key molecules of the cell nucleus.