Proline is amino-acid with special properties because it contains a side chain in which the R group on the α carbon is connected to the nitrogen (N). The covalent bond between the side-chain and the nitrogen has consequences on the properties of proline. Since there is no hydrogen attached to the nitrogen of a proline in a polypeptide chain, it limits proline capability to form main-chain hydrogen bonds. Also, the cyclic nature of proline imposes severe restrictions to the conformational freedom. There is a strict dependence between main- and side-chain proline conformations, so in proline, the trans isomer is only slightly favored over the cis isomer. Thus, proline can readily adopt the cis conformation.
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Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules or nutrients into adenosine triphosphate (ATP), and then release waste products.
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it is clearly the oxygen cycle
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use google or this
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And when is fire suppression appropriate? Experts in favor of letting natural forest fires burn unchecked argue that fire suppression disrupts the natural forest cycle and endangers the livelihoods of people who depend on the forest, and the wellbeing of the plants and animals living there.