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Mitochondrial Dna - Paper

Mitochondrial Dna


G proteins, named after the fact they bond with guanine nucleotides, are largely responsible for intercellular communications within the human organism. These transmissions regulate such functions as hormone secretion, muscle contaction, and even cognition. These transmissions take place because of chemical reactions between enzymes that bind with the G proteins and change into enzymes that trigger other chemical reactions. These chemical reactions induce cellular changes to occur by increasing a certain enzyme or chemical, thus changing the production or consumption of another chemical.
Epinephrine, starts the reactions by stimulating effectors, called adenlyl cyclase, which in turn ...

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by photons that strike rhodopsin. When the rhodospin it activates the G protein, transductin, to travel to the effector enzyme, and thus regulates the levels of soduim ions (Na+). The eye cells become hyperpolarized, thus producing a negative charge, signaling visual data to the brain.
The two afore mentioned receptors are just hundreds that exist in the human body. All the receptors employ the help of G proteins to produce such signals. G proteins regulate the transfer of signals by transfering and connecting chains of proteins, known as alpha, beta, and gamma. The combinations of the protein chains leads to an abundance of codes, with over one thousand combinations possible.
Before encoding the alpha, beta, and gamma subuntis, the three chains are bound together with the GDP unit. When the G protein enables the coding, the GDP detaches and sets out to work. The coding proteins then untangle, and code into their various functions. The G proteins therefore are simply ...

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PAPER DETAILS
Added: 1/6/2006 04:29:03 PM
Category: Science & Nature
Type: Premium Paper
Words: 349
Pages: 2

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