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Cards In This Set
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What is starch?
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A plant polysaccharide
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Starch is so abundant that it comprises what percent of a potato?
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60%-80%
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What 2 things is starch really made of?
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Amylose and Amylopectin
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What are Amylose and Amylopectin both composed of?
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Repeating units of glucose joined by glycosidic bonds
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How do Amylose and Amylopectin differ?
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In their branching pattern
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What 2 things is starch a rich source of?
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Carbon and simple sugars
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What is Amylase?
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An extracellular enzyme that catalyzes the hydrolysis of amylose and to a limited extent, amylopectin
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What does the Amylase enzyme break?
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Glycosidic bonds to produce maltose (disaccharide), glucose, and short-chain polysaccharides
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Once they are broken into smaller components, what can they do?
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Diffuse more rapidly through the medium and be transported into the cell
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These small carbohydrates are excellent sources of what and do what?
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Carbon and they feed directly into the respiratory pathways of bacteria
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How is starch agar made?
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By adding soluble starch to a general growh medium, like nutrient agar
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The soluble starch dissolves in the medium and is or is not visible in the agar?
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Is NOT
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What are starch plates inoculated with?
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Organism of choice then incubated for 24 to 48 hours
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Is starch visible in the medium?
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No
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Since is starch is not visible, what do we need to do?
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Add a reagent to identify the presence or absence of starch in the agar
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