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VIRUS Most viruses consist of four parts, the core, the capsid, the matrix, and the envelope. The core is located in the center of the virus and contains the virus’ DNA or RNA wrapped together with some proteins. The capsid is made of protein and forms a shell around the core.

http://membres.lycos.fr/nabiga/definitions/virus11.jpg
http://membres.lycos.fr/nabiga/definitions/virus11.jpg

The matrix forms a layer between the capsid and the envelope, while the envelope consists of lipids stolen from the cell membrane of the host cell that the virus is growing in. The envelope also contains proteins (mostly virus proteins). Viruses exist in just about every variation possible on this theme. Some viruses do not have a capsid for example, while others do not have an envelope. See the figures for examples. To see the original diagrams of these viruses (and other pictures of viruses) use the links below.

Virus: A microorganism smaller than a bacteria, which cannot grow or reproduce apart from a living cell. A virus invades living cells and uses their chemical machinery to keep itself alive and to replicate itself. It may reproduce with fidelity or with errors (mutations)-this ability to mutate is responsible for the ability of some viruses to change slightly in each infected person, making treatment more difficult.


ARCHEA

http://mentalfloss.cachefly.net/wp-content/uploads/2007/09/435_archaea.jpg
http://mentalfloss.cachefly.net/wp-content/uploads/2007/09/435_archaea.jpg

BACTERIA

http://www.scharfphoto.com/fine_art_prints/archives/199812-053-Soil-Bacteria.jpg
http://www.scharfphoto.com/fine_art_prints/archives/199812-053-Soil-Bacteria.jpg


CELL PARTS

  • Cell Membrane - forms the outer boundary of the cell and allows only certain materials to move into or out of the cell
  • Cytoplasm - a gel-like material inside the cell; it contains water and nutrients for the cell
  • Nucleus - directs the activity of a cell; it contains chromosomes with the DNA
  • Nuclear Membrane - separates the nucleus from the cytoplasm
  • Endoplasmic Reticulum - moves materials around in the cell
  • Ribosomes - make protein for the cell
  • Golgi Bodies - are used for packaging and secreting of energy
  • Mitochondria - break down food and release energy to the cell
  • Lysosomes - are chemicals used to digest waste
  • Vacuoles - are storage areas for the cell
Some organelles are found only in Plant cells. These organelles are:
  • Cell Wall - provides structure to the plant cell
  • Chloroplasts - contain chlorophyll that is make food for the plant cell

PLANT CELL

http://www.uvm.edu/~inquiryb/webquest/fa06/mvogenbe/plantcell.jpg
http://www.uvm.edu/~inquiryb/webquest/fa06/mvogenbe/plantcell.jpg

ANIMAL CELL

Cell Model Animation
Cell Model Animation

http://pathmicro.med.sc.edu/mhunt/yellow%20fever%20virus.jpg
http://pathmicro.med.sc.edu/mhunt/yellow%20fever%20virus.jpg
http://www.bbc.co.uk/london/content/images/2006/05/12/14_400x300.jpg
http://www.bbc.co.uk/london/content/images/2006/05/12/14_400x300.jpg
This is a leaf under a microscope, the yellow green line through the middle of the leaf are vanes.
http://jtoutdoors.com/images/whitetail%20buck.jpg
http://jtoutdoors.com/images/whitetail%20buck.jpg
http://www.hometrainingtools.com/misc/compound%20parts.jpg
http://www.hometrainingtools.com/misc/compound%20parts.jpg