a. Two arrestin genes (? -arrestin 1 and 2) have been characterized and are expressed ubiquitously. Over the past several years, the development of knockout mice in which the genes for ?-arrestin 1 and 2 have been inactivated have greatly aided the study of the physiological and cellular roles of […]

On a particular microscope, the numerical apertures of the condenser and medium power objective lenses are 1.25 and 0.25, respectively. You are supplied with a filter that selects a wavelength of 520nm. What is the limit of resolution on this microscope and will you be able to distinguish two points […]

Create a diagram in which you illustrate the energy flow among organisms of a food chain in a particular ecosystem. Select an ecosystem, such as a temperate forest, desert biome, or the Everglades. Determine the interdependency of life in your ecosystem by examining its organisms. Include the following in your […]

You sample a population of Salmonella typhimurium from a popular local hamburger joint Howdyburger. You find 9 isolates (clones) that are resistant to the antibiotics ampicillin and kanamycin, 32 isolates that are resistant to amipicillin but susceptible to kanamycin, and 51 isolates that are susceptible to both antibiotics. What is […]