Inthe same disease was reported from Germany. Virus diseases of plants have been described for many years. Degeneration of potatoes was known in Europe reported in the eighteenth century.
In this essay we will discuss about Viruses. After reading this essay you will learn about: General Characters of Viruses 2. Size of Viruses 3. Chemistry and Microstructure 5.
Biological Status or Nature 8. General Characters of Viruses: A large number of viruses are known.
Find all the books, read about the author, and more. Nov 03, · 1. Biology Essay Biology For First Lab - Words. pen attracts termites. I can think of two hypothesis for why they prefer the ballpoint pen over the marker, one is that the smell of the pen attracts the termite or the thickness of the lines made attracts the termites. Worksheets, lessons, sample problems, and more in every subject. Need a worksheet on linear equations? Or, an overview of literary devices? We've scoured the web to find and link to the best resources available to help you get your homework done.
They exhibit diversity of form and infect a number of organisms. Despite diversity of form and structure they show the following important characteristics common to all viruses: They are ultramicroscopic disease producing entities and smaller than bacteria.
They have no cellular organization and also no metabolic machinery of their own. Unit of structure of virus is virion which is a-cellular and lacks protoplasm.
Virion is simple in structure, basically composed of nucleic acid wrapped in a protein coat. They are highly physiologically specialized i. They are obligatory inter-cellular parasites as they are completely inactive outside the host.
They multiply within the host by taking over the metabolic machinery of the host cell. They are transmissible from diseased to healthy hosts. They are incapable of growth and division. They are effective in very small doses.
They are resistant to antimicrobial antibiotics and extreme physical conditions.
They can be crystallized and even in crystalline form, they retain their infectivity. They can be inactivated by chemotherapy and thermotherapy. They may undergo mutation. Viruses are very small ultra-filterable and ultramicroscopic structures. The average size of viruses ranges between the smaller bacterium and the largest protein molecule.
The foot and mouth disease virus is the smallest animal virus approximately 10 nm in size Fig.
Nov 03, · 1. Biology Essay Biology For First Lab - Words. pen attracts termites. I can think of two hypothesis for why they prefer the ballpoint pen over the marker, one is that the smell of the pen attracts the termite or the thickness of the lines made attracts the termites. Defence against infectious disease Define pathogen. Pathogen: an organism or virus that causes a disease.. Explain why antibiotics are effective against bacteria but not against viruses. Notes. pg. Biologists first suspected the existence of viruses near the end of the nineteenth century. At that time, European scientists were seeking to identify the infectious agent responsible for tobacco mosaic disease, a disease that stunts the growth /5(1).
The largest animal virus is parrot fever virus, approximately nm in size. The bacterial and animal viruses are larger than the plant viruses. The plant viruses vary in size from 17 nm to nm.
Viruses may be classified in relation to their shape into several groups: Viruses are spherical in shape e. These are rod shaped forms e. These are cube like e. Characteristic for viruses of the lower plants for example, Bacteriophages Fig. Rabies or Rhodoxin are bullet shaped Fig.
Chemistry and Microstructure of Virus: According to them virus particles are micro-proteins of high molecular weight. Each virus particle technically called virion consists of two parts:Worksheets, lessons, sample problems, and more in every subject. Need a worksheet on linear equations?
Or, an overview of literary devices?
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Notes and presentation over the nature of viruses intended for biology students. This lecture covers viral infection pathways, the structure of viruses, how viruses infect host cells and how our immune system responds. I like the faith message that I get out of the "literary device" viewpoint.
My only minor quibble is that the order of Genesis 1 is close enough to the natural scientific order. Find all the books, read about the author, and more. 1. INTRODUCTION - OVERVIEW - Biology as a science deals with the origin, history, process, and physical characteristics, of plants and animals: it includes botany, and zoology.
A study of biology includes the study of the chemical basis of living organisms, kaja-net.com related sciences include microbiology and organic chemistry.