Exam_2A_809ShortAnswerKey

Exam_2A_809ShortAnswerKey - BIO 307D Exam 2 October 19,...

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1 BIO 307D Name Short Answer Key Exam 2 October 19, 2009 Section II . Compare/contrast and define 4 of the following terms. Each answer is valued at 5 points. If you answer more than 4 of the following, your first 4 answers will be graded. If you write an answer and then decide that you do not want that answer to be graded, clearly draw a line through that answer page. [20 pts total] persistent viral infection and latent viral infection Persistent viral infections are those in which the virus infects a person and then continues to replicate over an extended period of time (years, perhaps a lifetime). Because of this, infectious viruses can continually be recovered from the patient’s body. Latent viral infections describe the condition in which a virus infects and begins replication. Some of the replicated viruses enter a host cell(s), but instead of continuing to replicate, the virus just maintains its genome in this cell. These viruses can be reactivated to replicate in response to various stresses over the lifetime of the patient. [Herpes simplex virus and Varicella zoster virus are examples of viruses that can establish latent infections, ‘hiding’ their genomes inside certain neurons.] sterilization and disinfection Sterilization describes any process that eliminates all infectious microbes from an object or a material - microbes can either be killed or removed by filtration. Disinfection describes any process that reduces the number of infectious microbes on inanimate materials, but does not necessarily destroy all microbes. [As a process, disinfection aims to eliminate harmful microbes, i.e. pathogens.] normal microflora and transient microflora Normal microflora (microbiota) are microbes that are adapted (evolved) to live on or inside our body. In their normal locations, they do not harm us; indeed by competing for space & nutrients, normal microflora can suppress the growth of harmful microbes. Transient microflora (microbiota) are microbes that come onto or into our body, but are not adapted to live on or in us. Transient microflora on the exterior of our body can be removed by washing with soap and water – whereas normal microflora are very difficult to remove because of their adhesion to our skin. synthetic drug and antibiotic Synthetic drugs are synthesized in the laboratory from basic chemicals. Antibiotics are chemicals produced by living microbes [largely fungi and soil bacteria]. Both synthetic drugs and antibiotics are capable of either killing other microbes or inhibiting their growth. plasma and serum
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This note was uploaded on 01/23/2010 for the course BIO 307D taught by Professor Moore during the Fall '09 term at University of Texas.

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Exam_2A_809ShortAnswerKey - BIO 307D Exam 2 October 19,...

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