Cell Structure

Topics: Cell, DNA, Organelle Pages: 7 (948 words) Published: May 22, 2013
Organelle |Function |Location | |
|Cell (plasma) membrane |Composed of proteins and a bilayer of lipid. |Outermost boundary of cell (animal) | | |Holds the contents of the cell in place. | | | |Regulates the movement of materials into and out of the cell using the | | | |selectively permeable membrane and receptor sites. | | |Cell wall |Composed of cellulose. |Outermost boundary of plant cell | | |Protects and support plant cells. Primary and Secondary. | | | |Pectin, a sticky fluid helps hold the cells together. | | |Nucleus |Acts as the brain of the cell. It directs all the cell’s activities. |Generally in the center of the cell within the cytoplasm. | | |Inside the nucleus, hereditary or genetic information is organized into| | | |threadlike structures called chromosomes. | | |Nuclear membrane |Holds all the genetic materials within the nucleus. |Outer layer of the nucleus | |Chromatin |During interphase, the genetic material is called chromatin. |Found within the nucleus. | | |It is all the DNA molecules and associated proteins in the nucleus. | | | |As chromatin, the chromosomes are long, thin strands dispersed | | | |throughout the nucleus in a tangled, fibrous mass. | | | |Directs cell activities while it is in interphase. | | |Chromosomes |Threadlike structures found within the nucleus. |Found within the nucleus. | | |Each chromosome contains a number of different | | | |characteristic-determining units, or genes. | | | |All chromosomes are composed of nucleic acid (deoxyribonucleic acid) | | | |and proteins. | | |Nucleolus |Associated with a second nucleic acid, ribonucleic acid. |Appears as a dark-stained, spherical structure inside the | | |Nucleolus is involved in making a genetic material called ribosomal RNA|nucleus. | | |used to direct the formation of ribosomes. | |...
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