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ernesto rizo

on 27 April 2010

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Transcript of Biology

Parts of the cell Mitochondria provide the energy a cell
needs to move, divide, produce secretory
products, contract - in short, they are the
power centers of the cell. They are about
the size of bacteria but may have different
shapes depending on the cell type. Centrioles are involved in the organization
of the mitotic spindle and in the completion
of cytokinesis. Centrioles were previously
thought to be required for the formation of a
mitotic spindle in animal cells. Vesicles store, transport, or digest cellular
products and waste. The membrane enclosing
the vesicle is similar to that of the plasma
membrane, and vesicles can fuse with the plasma
membrane to release their contents outside of the
cell. Vesicles can also fuse with other organelles
within the cell. The cytosol has no single function and is instead the site of multiple cell processes. Examples of these processes include signal transduction from the cell membrane to sites within the cell, such as the cell nucleus, or organelles. This compartment is also the site of many of the processes of cytokinesis, after the breakdown of the nuclear membrane in mitosis. Another major function of cytosol is to transport metabolites from their site of production to where they are used. Parts of the endoplasmic reticulum to which ribosomes
are attached on the cytoplasmic side; involved in the
biosynthesis of proteins for export to the outside of the
cell and enzymes to be incorporated into cellular organelles
such as lysosomes. Ribosomes are the components of cells that make proteins from amino acids. One of the central tenets of biology is that DNA makes RNA, which then makes protein. Ernesto Rizo
Pablo Horn PROF: RAMON HERNANDEZ A part of endoplasmic reticulum that is tubular in form and lacks ribosomes. Its functions include lipid synthesis, carbohydrate metabolism, calcium concentration, drug detoxification, and attachment of receptors on cell membrane proteins. The cell’s outer membrane made up
of a two layers of phospholipids with
embedded proteins. It separates the
contents of the cell from its outside
environment, and it regulates what
enters and exits the cell. A flagellum is a tail-like projection that protrudes from the cell body of certain prokaryotic and eukaryotic cells, and functions in locomotion. Lysosomes are spherical organelles that contain enzymes.They break up food so it is easier to digest. The Golgi complex is an organelle found in
eukaryotic cells. It changes and packages
proteins ready for export from the cell. It
consists of a stack of about six flat disks. In cell biology, the nucleus also sometimes referred to as the "control center", is a membrane-enclosed organelle found in eukaryotic cells. It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. Microtubules are conveyer belts inside the cells.
They move vesicles, granules, organelles like
mitochondria, and chromosomes via special
attachment proteins. 2°period Team:
Full transcript