The Control of the Cell Cycle

Phases of Mitosis in Plant and Animal Cells Cell Division Overview Clockwise, from top left: embryonic sea urchin cells, frog skin cells, neuron, 8-cell fish embryo. All of the living organisms on Earth are made up of one or more cells, which are the simplest units of life capable of independent existence and reproduction. Cells have the extraordinary ability to make nearly identical copies of themselves by the process of cell division. Since new cells are only produced by existing cells, cell division is essential for the continuation of life. There are a variety of reasons that might cause a cell to divide: Multicellular organisms grow in size and complexity by making more cells. Two events are required for successful cell reproduction. The second requirement is the partitioning of cytoplasm between the two daughter cells. The Cell Cycle The orderly program of events in the lifetime of a cell is known as the cell cycle. The Phases of Mitosis Compare and contrast mitosis in the following plant and animal cell pictures: Prophase Anaphase

Operate Now: Brain Surgery To play the super cool games on www.agame.com, you need a plugin called Flash. Chrome, the browser you’re using, will not have this anymore. If you see this icon: , in the top right-hand corner of your browser, click on it. To play the games, you need to click on “Always allow plugins on www.agame.com”. It’s safe, don’t worry. To always have a super-awesome time on our website, we also recommend to do these quick steps:Type [ in the address bar on top, and then press Enter to open the Plugins section of Chrome 1. Fehérjék The WikiPremed MCAT Course is a free comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum.Please read our policies on privacy and shipping & returns.Contact Us.MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course. The work of WikiPremed is published under a Creative Commons Attribution Share Alike 3.0 License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions. You can use the resources here for commercial or non-commercial purposes, but please give attribution and a link to the production credits and edit history of the resource.

Translation Cell Size and Scale Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. Smaller cells are easily visible under a light microscope. To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Carbon The size of the carbon atom is based on its van der Waals radius.

Protein Synthesis