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This is RAT 2

by: Sara Ali

This is RAT 2 10062

Sara Ali

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About this Document

Almost done with RAT 2, good for the module quiz coming up
General Biology 2
Rachel Hudspeth
Class Notes
25 ?




Popular in General Biology 2

Popular in Biology

This 1 page Class Notes was uploaded by Sara Ali on Tuesday September 6, 2016. The Class Notes belongs to 10062 at University of Houston Downtown taught by Rachel Hudspeth in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Biology 2 in Biology at University of Houston Downtown.


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Date Created: 09/06/16
RAT 2         • The textbook means when it says, “viruses lead a kind of borrowed life”, because viruses are capable of causing many diseases, researchers in the late 1800s saw a parallel with bacteria and proposed that viruses were the simplest living forms. Most biologists studying the viruses today would likely agree that they are not alive but exist in a shady area between life-forms and chemicals • Viruses are composed of two types of macromolecules which are nucleic acid surrounded by a protein coat. • Two types of polynucleotides that a virus could carry are DNA and RNA, • Viral capsid is the protein shell enclosing the viral genome and Viral envelopes are derived from the membranes of the host cell, they contain host cell phospholipids and membrane proteins. • For the influenza virus, the origin of the viral envelope is that they have different RNA molecules, each wrapped in a helical capsid, and an outer envelope studded with glycoprotein spikes. • Two different origins for the proteins or the glycoproteins found within the viral envelope is that glycoproteins are proteins with carbohydrates covalently attached. • Bacteriophages are many of the most complex capsids found among the viruses that infect bacteria. The first phages included seven that infect E.coli, such as Type (T1), Type 2 (T2), Type3 and so forth. Their capsids have elongated icosahedral heads enclosing their DNA. Attached to the head is a protein tail piece with fibers by which the phages attach to bacterium. 17.2 1. a. When virus enters a host cell, it releases the viral DNA and capsid proteins. b. After the viral genome is released into a host cell, the host enzymes replicate the viral genome. c.


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