PPT-Virus-Cell Interaction Viruses often encode genes that induce, mimic, or shut down host

Host has elaborate systems to shut down viral functions The outcome of infection may vary from essentially benign and undetectable to tolerated to lethal Physiologic immune or inflammatory responses of the host. red up down down up down down up yellow grey-blue up down down up grey-blue russet peacock peacock russet russet blue red up down down up green green white (blue) Kitchen Servants' Dormitory Scullery A. Viruses are a unique group of biological entities. 1. They are not capable of surviving without a host cell (lack metabolic machinery). 2. They do, however, contain all the information necessary to direct metabolic processes. Viruses Are Not Cells!. There are several structural and functional differences between cells and viruses. The structural differences include:. No nucleus. No cell membrane. No organelles. The functional differences include:. The Human Genome project sequenced “the human genome. ”. “the human genome” that we have labeled as such doesn’t actually . exist. What we call the human genome sequence is really just a . reference. Instructions. You may use your notes.. Write your answers in the spaces provided.. This review is due at the end of the period!. 1. What . process is . shown in . the . diagram below. ?. . Describe what is happening in each step.. STRUCTURE. A core nucleic acid - DNA or RNA. Nucleic Acid surrounded by a protein, called a capsid.. CLASSIFICATION. By genomes: DNA viruses, RNA viruses or retroviruses . (any . of a group of RNA viruses that insert a DNA copy of their genome into the . What are the characteristics of viruses? Bacteria? What kingdom do each of these belong? Are they living? Why or why not. ?. What do you already know?. What are the differences between viruses and bacteria?. Draw the basic structure of a virus. Label and define capsid, viral envelope and nucleic acid.. Ch. 17 Warm-up. Draw the lytic/lysogenic cycle.. What stage of the lytic-lysogenic cycle is a virus virulent? Temperate?. Are Viruses Living or Non-living?. Biologists consider viruses to be non-living because:. Are not cells. Do not grow or respond to their surroundings. Cannot make food, take in food, or produce wastes. . . The process of transfer of virus into host is referred as . TRANSMISSION. and this is an important step in the life cycle of viruses.. Person to person infections are said to be . HORIZONTAL. . (Assistant Professor). College of Fisheries, . Kishjanganj. BASU, Patna. Characteristics of viruses. Viruses may be regarded as . exceptionally complex aggregations . of . nonliving chemicals . or . exceptionally simple living microbes. Viruses are not alive. A virus in an obligate intracellular parasite. Requires host cell to reproduce. Can be seen at magnifications provided by the electron microscope (they are microscopic). Characteristics of Viruses. Viruses are the most primitive microorganisms infecting man. . General properties. Obligate intracellular . Possess either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid), but never both . Smaller than bacteria, can be passed through the bacterial filters. Xabier. López-Alforja. 1. *, David López-Escardó. 1. , Manuel Martínez García. 2. , Sheree Yau. 3. , Ramon Massana. 1. , Felipe H. Coutinho. 1. & Dolors Vaqué. 1.  . DB. nº query scaffolds .