Virtual cell biology classroom on from the virtual

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Virtual Cell Biology Classroom on ScienceProfOnline.com From the Virtual Microbiology Classroom on ScienceProfOnline.com
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MacConkey's (MAC) MacConkey’s media is both selective & differential . 1. Selective because it only grows Gram-negative bacteria . Inhibits the growth of Gram-positive bacteria. 2. Differential because neutral red (pH-sensitive dye) and lactose (type of sugar) have been added to media. - Bacteria that use ____ (a disacchride) for food, produce acidic metabolites that trigger the pH sensitive dye to turn pink. - So lactose fermenting bacteria will grow in bright pink colonies while non-lactose fermenters will be colorless and clear. Q: Regardless of the color of the plate, what do know about bacteria found growing on MacConkey’s? Q: If there is growth, what additional information is provided when the color of the bacteria is examined? Enteric bacteria are the most frequently encountered bacteria isolated from many types of clinical specimens. They are most commonly lactose fermenters. Image: McConkey’s growing Salmonella on the left, and E. coli on the right, T. Port From the Virtual Microbiology Classroom on ScienceProfOnline.com Watch VIDEO : How to Interpret MacConkey’s Agar (MAC)
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Organic Molecules - Proteins Proteins are macromolecules, polymers composed of monomers called… ___________ contain a: 1. base amino group ( -NH 2 ) 2. acidic carboxyl group ( -COOH ) 3. hydrogen atom …all attached to same carbon atom (the α carbon…alpha carbon). Fourth bond attaches α -carbon to a side group (--R) that varies among different amino acids. There are hundreds, but most organisms use only 21 amino acids to build proteins. Side groups important … affects the way a proteins amino acids interact with one another, and how a protein interacts with other molecules. From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Organic Molecules – Proteins ? ___________ _________ ? Link amino acids together in chains, like the beads on a necklace. A dipeptide is 2 amino acids linked together. A polypeptide, more than two. Image: Protein Primary Structure , Wiki From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Protein Structure Image: Levels of protein structure , M Ruiz From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Organic Molecules - Proteins Complex organic macromolecules fundamental to living cells. Composed of one or more chains of amino acids. Proteins perform many functions in cells, including: 1. ________________ • Components in cell walls, membranes, and within cells themselves. 2. ________________ • Chemicals that speed up a chemical reaction. • The catalysts in cells are called enzymes . 3. ________________ • Some regulate cell function by stimulating or hindering either the action of other proteins or the expression of genes. 4. _________________ • Some act as channels and “pumps” that move substances into or out of cells.
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