2 Chemical composition of the body

2 Chemical composition of the body - Biology141...

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Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%202(2008).htm Biology141 (Physiology) Lecture 2 M. Whim CHEMICAL COMPOSITION OF THE BODY. [1]. BACKGROUND. carbon is versatile, it can bond with other carbon atoms carbon backbone ( a huge variety of molecules). it also readily forms bonds with other atoms. carbon backbones can have a variety of functional groups (called “R” groups). (a). Monomers and polymers . carbon can form macromolecules with a wide range of molecular weight. most macromolecules are polymers (made of a repetitive series of similar subunits called monomers). Examples are: 1. 2. Monomers join by polymerization in a dehydration (condensation) reaction. Loss of OH and H groups (i.e. H 2 O hence the name). Two monomers form a dimer with the formation of a covalent bond. Digestion of dimers occurs by hydrolysis which is the opposite reaction (i.e. the covalent bond is broken, OH is added to one monomer and H is added to the other). (b). The organic molecules of life. can be divided into 4 categories carbohydrates lipids proteins nucleic acids [2]. CARBOHYDRATES. · general formula C n H 2n O n (for example?). · types: mono, di and polysaccharides.
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2 Chemical composition of the body - Biology141...

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