38. You isolate an infectious substance that is capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. You have four methods at your disposal that you can use to analyze the substance in order to determine the nature of the infectious agent. A) The plants would develop some but not all of the symptoms of the TMV infection. B) The plants would develop symptoms typically produced by viroids. C) The plants would develop the typical symptoms of TMV infection. D) The plants would not show any disease symptoms. E) The plants would become infected, but the sap from these plants would be unable to infect other plants C) Only the genetic material of the virus is involved in the cell's infectivity, and is injected like the genome of a phage. D) The viral envelope mediates entry into the cell, the capsid entry into the nuclear membrane, and the genome is all that enters the nucleus. A) The plants would develop some but not all of the symptoms of the TMV infection. B) The plants would develop symptoms typically produced by viroids. C) The plants would develop the typical symptoms of TMV infection. D) The plants would not show any disease symptoms. E) The plants would become infected, but the sap from these plants would be unable to infect other plant The central dogma has also been described as DNA makes RNA and RNA makes protein, a positive statement which was originally termed the sequence hypothesis by Crick. The central dogma of molecular biology is an explanation of the flow of genetic information within a biological system. It was first stated by Francis Crick in 1956 and re-stated in a Nature paper published in 1970: Example Question #2: Understanding Viruses And Prions. Human immuodiffiency virus (HIV) contains a special type of enzyme that makes it difficult to classify and develop a vaccine for the virus. The special enzyme of HIV is __________. Viruses leave their ribosomes outside of the host cell as they have already synthesized all necessary proteins prior to infection. Correct answer: Viruses hijack the ribosomes of host cells in order to create the necessary proteins when reproducing. 37. You isolate an infectious substance that is capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. You have four methods at your disposal that you can use to analyze the substance in order to determine the nature of the infectious agent. A) The plants would develop some but not all of the symptoms of the TMV infection. B) The plants would develop symptoms typically produced by viroids. C) The plants would develop the typical symptoms of TMV infection. D) The plants would not show any disease symptoms. E) The plants would become infected, but the sap from these plants would be unable to infect other plants Explanation : Reverse transcriptase is the epitome of viral evolution, as showcased by the HIV virus. Reverse transcriptase enables the HIV virus to create a DNA template from an RNA segment already encapsulated in the virus, but using the host cell's own DNA replication machinery. Viruses leave their ribosomes outside of the host cell as they have already synthesized all necessary proteins prior to infection. Correct answer: Viruses hijack the ribosomes of host cells in order to create the necessary proteins when reproducing. Answered in BIOL1703 final. The difference between vertical and horizontal transmission of plant viruses is that. veritcal transmission refers to the transmission of a virus from a parent plant to its progeny, and horizontal transmission refers to one plant spreading the virus to another plant.  Stanley B. Prusiner. Bovine spongiform encephalopathy (BSE) and human Creutzfeldt-Jakob disease (CJD) are among the most notable central nervoussystem degenerative disorders caused by prions. CJD may presentas a sporadic, genetic, or infectious illness. Prions are transmissibleparticles that are devoid of nucleic acid and seem to be composedexclusively of a modified protein (PrP Sc). The normal, cellular prion protein (PrP C) is converted into PrP Sc through a posttranslational process during which it acquiresa high-sheet content.
http://www.easynotecards.com/notecard_set/7782 http://www.easynotecards.com/notecard_set/7782 https://en.wikipedia.org/wiki/Central_dogma_of_molecular_biology http://www.varsitytutors.com/ap_biology-help/understanding-viruses-and-prions http://www.easynotecards.com/notecard_set/7782 http://www.varsitytutors.com/ap_biology-help/understanding-viruses-and-prions http://www.funnelbrain.com/c-1152908-prions.html http://www.sciencemag.org/site/feature/data/prusiner/245.xhtml
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