The nucleolus is found in the nucleus of a cell and appears as a dark spherical region when seen through a microscope. The nucleolus is one of the largest physical structures within the nucleus and can occupy up to a qua... More »

A nucleolus is a substructure composed of nucleic acids and proteins that is found within the nucleus of a cell. Known as the ribosome production factory, malfunction of the nucleolus has been found to cause disease in h... More » Science Biology Cells

The nucleolus contains all of the information needed for DNA replication, flow of proteins and RNA, all while controlling the synthesis of protein and cell replication. The nucleolus has several parts: the nuclear envelo... More » Science Biology Cells

The nucleolus of a cell is part of the production of ribosomes and contains the cell's RNA, one of the vital building blocks that tells the cell what it is. Ribosomes generate proteins that are needed for the basic funct... More »

An unstained onion cell is a segment of onion that has not been dyed to make it easier to see beneath a microscope. All living things have cells that can be observed when placing them beneath a microscope. Adding a stain... More »

In a typical onion cell lab, students observe the structure of onion cells using a microscope. Students usually complete the lab using both low-power and high-power magnification. More »

The first cell seen under a microscope was that of a cork, comprised of dead plant cells. In 1665 Robert Hooke was the person to first see these plant cells under a microscope. More »