Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Viruses
Viruses are sub cellular, ultramicroscopic infectious agents of 20 nm-300 nm size range Many of them cause diseases like polio, dengue, small pox, measles, rabies, common cold etc., in animals and mosaic, dwarfing, curling etc. in plants. They are obligate intracellular parasites. In other words, they multiply only inside living cells. They consist of a protein coat or capsid surrounding a nucleic acid core of either DNA or RNA.Viruses were discovered in 1892 by a Russian biologist Iwanowsky, as'filter-passing agents' though they were seen much later, with the advent of electron microscope.
They share certain characteristics of both living and non-living things. So it will be useful to examine the properties of viruses. They are considered living because they can reproduce even though only when they are inside host cells, using the host cell machinery. On the other hand, they have some nonliving properties as well. When they are outside the host cell they can also undergo crystallisation like any other chemical substance. They do not have metabolism and so are metabolically inert. They cannot take up metabolic substances from the environment and lack the biochemical machinery like ribosomes or ATP generating systems to synthesize nucleic acid and proteins. They do not have their own enzyme system. They also do not exhibit growth or respond to stimuli.
What is Biomaterial Biomaterial is defined, in the broader sense, as any pharmacologically inert material that is capable of interacting with a living organism without causing
what is the fertilization?
Q. Is there interphase again between meiosis II and meiosis I? There is no interphase or DNA duplication between the divisions of meiosis. Only a short interval termed as diaki
Talk about briefly three of the common enteric diseases caused by inadequate clean water supply and insufficient sanitation facilities. Your talk should contain the source and spr
classifying kingdom of organisms
what compound is phosphorylated for ATP? what is the resulting compound when ATP releases energy
The nerve centres which control the body temperature and the urge for eating recontained in: 1. Hypothalamus 2. Pons 3. Cerebellum 4. Thalamus Hypothalamus is the
Neural process occurring in the recovery from brain injury The neural process occurring in the recovery from brain injury are thought to be similar to the processes involved in
Define the Nutritional Assessment Tools? Malnutrition/protein energy malnutrition amongst elderly persons has been observed in various studies -be it hospitalized patients, nur
Suppose you are in charge of designing a microcontroller-based system for a packet processing application. These are high speed internet packets from the PC that are going to be pr
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd