nester02 - molecules that affect bacterial growth. These...

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1 Chapter 2: The Molecules of Life Important Point: Weak Bonds Holding Substances Together Weak Chemical Bonds form the Basis for the Existence of Life! Salt Dissolving in Water pH: acid < 7, base > 7 To maintain the pH near neutrality, buffers typically are present in microbial growth media.
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2 Proteins/Protein Structure Proteins only work properly if their “primary structure” = order of amino acids is correct. Proteins only work properly if their tertiary (or quaternary) structures are intact. Protein Denaturation: High salt concentrations, detergents, reducing agents, etc. can also denature proteins. Lipid Bilayer Membranes are held together by weak intermolecular interactions between phosopholipids and other molecules including with proteins. Some Relevant Small-Molecules ± In lab we’ll consider small (and some not so small)
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Unformatted text preview: molecules that affect bacterial growth. These include (but are not limited to): Glucose, Lactose, Sucrose (sugars/carbs) Mannitol (alcohol sugar) &amp; Starch (both carbs) Citrate &amp; Malonate (Kreb cycle intermediates) Nitrate (alternative final electron acceptor) Casein (milk protein) &amp; Gelatin (also a protein) Amino acids (the units that make up proteins) Urea (nitrogenous waste removed by kidneys) Other substrates include more complex substances such as peptone &amp; tryptose (both of which consist of partially digested proteins) . We will also consider a large number of salts, indicators (including pH indicators), pH buffers, metabolic products, &amp; inhibitors of bacterial growth. Link to Next Presentation...
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nester02 - molecules that affect bacterial growth. These...

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