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Any of various submicroscopic agents that infect living organisms, often causing disease, and that consist of a single or double strand of RNA or DNA surrounded by a protein coat.Unable to replicate without a host cell, viruses are typically not considered living organisms.2. varves In geological formations, annual alternating layers caused by seasonal variation.

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His teaching career started in Zaire, Africa, where he taught biology, chemistry, political economics, and physical education in the Peace Corps. He is now the director of the Loudoun Academy of Science, a magnet school for science and technology that he helped create. Wolfe has also been an Emmy-winning television host, fielding live questions for the PBS/WXXI production of Homework Hotline as well as writing and performing in "Football Physics" segments for the Buffalo Bills and the Discovery Channel.Allosteric modulation and biased agonism at GPCRs could be manifestations of the same underlying 'conformational selection' mechanism, and these can be harmonized by considering the influence of ligand-receptor residence time and kinetic context. Undulipodia function in moving the cell, the organism to which the cell belongs, or fluid in contact with the cell. The internal surface (lumen) of the human ureter is star-shaped (see figure). The tube leading urine from the bladder to the exterior of the body. The ultimate product of nucleic acid catabolism; main nitrogenous component of urine in birds and reptiles. It is not a difficult concept, but very few people -- the majority of biologists included -- have a satisfactory grasp of it.One common mistake is believing that species can be arranged on an evolutionary ladder from bacteria through "lower" animals, to "higher" animals and, finally, up to man.

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