BIOD 171 MODULE 5 EXAM QUESTIONS WITH 100% CORRECT ANSWERS!!

The concept of treating all samples, whether known or unknown, as potentially hazardous (or pathogenic) materials is known as _____. - Answer-universal precautions List at least 3 observations a researcher would be sure to note while assessing an unknown microbial sample. - Answer-size and shape, motility, gram status, color change, chemical reactions While observing an unknown sample of limited amounts, a researcher must determine motility and Gram status using the same sample. What would you determine first and why? - Answer-Motility would be determined before gram status because motility is easily observed on a wet mount. The sample would need to be killed through heat fixing in order to determine gram status A Facultative anaerobe is a microorganism capable of growth under what conditions? - Answer-A microorganism capable of growth under aerobic and anaerobic conditions As streptococcus is catalase negative would it thrive or die in the presence of peroxides? Why? - AnswerIt would die in the presence of peroxides because it is unable to breakdown peroxides streptococcus is most often streaked onto: - Answer-blood agar True or False: the Lancefield groups are used to subdivide antigenic groups of alpha-hemolytic Streptococcus - Answer-False True or False: the Lancefield groups are used to subdivide antigenic groups of gamma-hemolytic Streptococcus - Answer-false Greater than 90% of all human streptococcal infections belong to (multiple choice) - Answer-group A The distinctions for Lancefield subgroupings lie in its: (select all that apply) - Answer-Carbohydrate composition of antigensleft untreated, strep throat can progress to___, which displays ___ hemolytic activity. - AnswerRheumatic fever ; beta Rheumatic fever displays (blank) hemolytic activity and occurs when (blank) is left untreated - AnswerBeta; strep True or false: under most circumstances, staphylococcus can be found in ~80% of human population where it remains non-symptomatic - Answer-false True or false: under most circumstances, staphylococcus can be found in ~30% of human population where it remains pathogenic - Answer-false Define commensal bacteria - Answer-Commensal bacteria doesn't harm or benefit from the host which it gets nutrients When a bacterium neither harms nor benefits from the host from which it obtains nutrients, it is referred to as being - Answer-Commensal How can staphylococcus be differentially tested? - Answer-In the presence of Bile salts pathogen suppresses host immune system so it can continue replicating - Answer-evasion pathogen passes through or between cells to access deeper tissues and nutrients - Answer-infection pathogen is passed to another host to restart lifecycle - Answer-transmission Match the following diseases with their respective symptoms: 1. folliculitis 2. scaled- skin syndrome igo 4. lma neonatorum A. Childhood skin disease near mouth/ nose B. infection of thin, transparent scleral tissue C. infection occurs at time of birth D. Pus-filled lesions on skin or hair E. Ruptured pustules ; treated with penicillin - Answer-1.) D 2.) E 3.) A 4.) B 5.) C Match the steps of infection to its description: Pathogen finds a specific target Pathogen masks its own antigen Utilization of a portal to gain - Answer-1. attachment 2. evasion 3. entry True or false. The causative agent of conjunctivitis can be either bacterial or viral - Answer-true