It’s Thanksgiving day at the Simpsons’ and Bart has removed the labels from the olive oil (primarily monounsaturated fatty acids) and canola oil (primarily polyunsaturated fatty acids) and no one can figure out which bottle is which. As the use of the wrong oil would be disastrous for salad dressings […]

Assignment Chapter 10: Controlling Microbial Growth in the Body: Antimicrobial Drugs The History of Antimicrobial Agents 1. Describe the antimicrobial contributions of Paul Ehrlich, Alexander Fleming, Gerhard Domagk, and Selman Waksman. Mechanisms of Antimicrobial Action 2. Describe what selective toxicity is and how it works. Describe how selective toxicity affects […]

E. coli chromosomes in which every nitrogen atom is labeled (that is, every nitrogen atom is the heavy isotope 15N instead of the normal isotope 14N) are allowed to replicate in an environment in which all the nitrogen is 14N. Using a solid line to represent a heavey polynucleotide chain […]

The gene that encodes the enzyme called tyrosine hydroxylase is known to be up regulated by the CREB protein.  Tyrosine hydroxylase is expressed in nerve cells and is involved in the synthesis of catecholamine, a neurotransmitter.  The expose of cells to adrenaline normally up regulates the transcription of the tyrosine […]