eukaryotic cells that contain various membrane-bound organelles. Allele

a controlled sequence of steps in which cells signal self termination. Asters

the study of living organisms. Cell

a process by which cells harvest the energy stored in food. Cell Biology

the life cycle of a dividing cell. It includes Interphase and the M phase or Mitotic phase (mitosis and cytokinesis). Cell Membrane

one of the five basic principles of biology. It states that the cell is the basic unit of life. Centrioles

a region on a chromosome that joins two sister chromatids. Chromatid

mass of genetic material composed of DNA

a long, stringy aggregate of genes that carries heredity information (DNA) and is formed from condensed chromatin.

consists of all of the contents outside of the nucleus and enclosed within the cell membrane