Protein folding is the physical process by which a protein chain acquires its native 3-dimensional structure, a confirmation that is usually biologically functional, in an expeditious and reproducible manner. It is the physical process by which a polypeptide folds into its characteristic and functional three-dimensional structure from random coil. Each protein exists as an unfolded polypeptide or random coil when translated from a sequence of mRNA to a linear chain of amino acids. This polypeptide lacks any stable (long-lasting) three-dimensional structure (the left-hand side of the first figure). As the polypeptide chain is being synthesized by the ribosome, the linear chain begins to fold into its three-dimensional structure. Folding begins to occur even during translation of the polypeptide chain. Amino acids interact with each other to produce a well-defined three-dimensional structure, the folded protein (the right-hand side of the figure), known as the native state<span>.</span>
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ARN perolimasa sintetiza un transcrito de ARN complementario a la cadena molde de ADN en dirección 5' a 3'. La enzima avanza a lo largo de la cadena molde en dirección 3' a 5' y al avanzar abre la doble hélice del ADN.
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te ayudo
D. Natural gas. It has similar properties to fossil fuel/oil but is mainly methane.
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These impacts include compaction, loss of soil structure, nutrient degradation, and soil salinity. The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species.