Proteins Ap Biology

Kirstie Javier
AP Biology
Period 4
November 14, 2011
Proteins
Proteins ar biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. Some types of chemical bonds/ interactions argon disulfide bonds, hydrogen bonds, bean bonds, and hydrophobic interactions. Disulfide bonds form when two cytosine molecules join in concert to form a bond between their two sulfur atoms. Such bonds cross-link polypeptide chains or portions of chains. Because they are non cold covalent bonds, they are very strong bonds and not easily broken. They are considered to be part of primary structure, although they do contribute to the three-dimensional conformation of the proteins. Hydrogen bonds form when a hydrogen atom is covalently bonded to one electronegative atom (usually group O or nitrogen) and is simultaneously attracted to another electronegative atom. A aerated R-group in one part of a polypeptide chain tidy sum attract an oppositely charged R-group in another part of the chain. The force of such(prenominal) an electrostatic attraction is the ionic bond, sometimes called a salt linkage, salt bridge, or electrostatic bond. Non polar R-groups go to cluster together in water. These weak associations are called hydrophobic interactions.



When the polypeptide chain folds, the hydrophobic R-groups tend to be stiff to each other in the interior of the folded chain, whereas hydrophilic R-groups tend to be on the outside, attracted to water. The diagram below illustrates some hydrophobic interactions between R-groups. Hydrophobicity of various amino acids.
About 12 percent of your entire body mass is protein. All types of protein are do from amino acids. Some of these are essential, meaning they cannot be make by the body and therefore must be eaten. Others are produced in the body, so they are still very fundamental; just not essential. Without protein, many body functions wouldnt occur, such as muscle contractions....If you want to get a entire essay, order it on our website: Orderessay



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