Introduction to Biology (Zambak) by Osman ARPACI, Tunay TUNCER

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Photoreceptors Chemoreceptors Mechanoreceptors 1. : Eye structures in Drosophila and house fly. Photoreceptors are found in the eye and are light sensitive. The human eye is capable of detecting light between 4000 and 7400 Å. Different organisms have different types of eyes for detecting light. The eyes of vertebrates are similar to each other in structure and function, resembling a simple camera. The eyeball and accessory structures are parts of the vertebrate eye. : The structures involved in sight.

The most commonly used medium for bacteria is agar. Agar is a gelatin-like substance that dissolves in water at 90 °C and solidifies at 40 °C. According to the bacteria to be grown, necessary nutrients are added to the agar during preparation. The agar is inoculated with bacteria to form pure colonies. To this culture antibiotic is added to see how bacteria are affected. When affected, no colony forms. If they survive, they are demonstrated to be resistant to the antibiotic. Bacteria can be observed under a microscope.

Whereas normal cells cannot be crystalized, and crystalized cells cannot be revived, viruses can do both. simplex type II Genital diseases Viruses are nucleoprotein structures. They consist of a protein envelope containing a nucleic acid (DNA or RNA). Varicella–zoster Chicken Pox Epstein–Barr Certain types of Cancer Papovavirus Benign Tumors Features of Viruses: Parvovirus Anemia They have no cytoplasm or metabolism. They use the metabolism of the cells in which they live. Poxvirus Small Pox Studies with the electron microscope show that viruses may be quite variable in size.

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