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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 […]

An active discussion is the key to an interesting and engaging online course. Discussions in this course are designed to simulate a classroom discussion. As you join in the discussion, you should read what has already been posted and continue with the discussion from there. The first question asks you to voice […]