BI 234

LECTURE 7 IMMUNITY BI 234 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ Activation of B cells Activation by antigen is aided by cytokine (secreted by helper T CD4+ ) Stimulated by antigen and cytokines, B Cells proliferate into memory and effector/plasma cells (secrete antibodies) Activation of T cells CD8 surface marker protein attaches to MHC I (all nucleated cells); APCs, exogenous antigen processing, peptide/MHC I complex on surface, binds to receptor/CD8; A...

BI 234 EXAM 1 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++ LATEST UPDATE A major milestone in the history of microbiology was the development of the "germ theory of disease" in 19th century Europe. Which of the following is NOT a true statement about this theory? a. It said that diseases of people and other animals could be caused by living organisms too small to be seen with the unaided eye b. It arose partly from observations about bacterial contamination of fermentati...

PCC BI 234 BRIGGS EXAM 1 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ Contributions of van Leuwenhoek First to observe bacteria using homemade microscopes Contributions of Pasteur Yeasts are responsible for alcohol fermentation. Developed pasteurization Contributions of Koch Proved that bacterium causes anthrax. Came up with Koch's Postulates. Contributions of Semmelweis Advocated handwashing in-between patient contact Contributions of Lister Used chemical dis...

BI 234 SKIN DISEASES EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE acne vulgaris affects 60-70% of the US at some point, disease of the normal microbiota, Proprionbacteria acnes, gram positive bacteria, genetic predispositions can lead to more severe cases impetigo caused by staphylococcus aureus, gram positive, superficial rash that spreads directly from person to person, also caused by streptococci, prevention is good hygiene and treatment is antibiotics, prim...

BI234 ANTIBIOTICS EXAM QUESTIONS AND ANSWERS VERIFIED Aztreonam Disrupts peptidoglycan synthesis Cephalexin Disrupts peptidoglycan synthesis Ceftaroline Disrupts peptidoglycan synthesis Imipenem Disrupts peptidoglycan synthesis Penicillin G Disrupts peptidoglycan synthesis Penicillin V Disrupts peptidoglycan synthesis Vancomycin Disrupts peptidoglycan synthesis Streptomycin Does not disrupt peptidoglycan synthesis Gentamicin Does not disrupt peptidoglycan synthesis Chloramphen...

BI234 MATCHING EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED Bacillus anthracis eschar Bordetella pertussis whooping cough Borrelia burgdorferi Lyme disease Campylobacter jejuni most likely cause of gastroenteritis in USA Clostridium botulinum infants <1 yr old shouldn't eat honey Clostridium difficile pseudomembranous colitis Clostridium perfringens gas gangrene Clostridium tetani lockjaw Chlamydia trachomatis nongonococcal urethritis Corynebacterium dip...

BI234 METABOLISM QUIZ AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE Where does photosynthesis happen in eukaryotes vs prokaryotes? Eukaryotic: happens in chloroplasts (the pigment molecule is chlorophyll) (plants and protozoans) Prokaryotic: happens in the cell membrane (pigment molecule is the bacteriochlorophyll) (bacteria) Why do bacterial cells have folded membranes? Because it increases the surface area and allows for more pigment molecules to be present and therefor f...

BI234 PATHOGEN EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS Staphylococcus aureus + a form of staphylococci that commonly infects wounds and causes serious problems such as toxic shock syndrome or produces food poisoning Staphylococcus epidermidis + Infects prosthetic devices and catheters. Component of normal skin flora. Contaminates blood cultures. Streptococcus pyogenes + strep throat Streptococcus mutans + dental caries Streptococcus pneumoniae + pneumococcal pneumonia Bac...

BI 234 FOR TEST 1 EXAM QUESTIONS AND ANSWERS WITH COMPLETE VERIFIED What distinguishes a eukaryote from a prokaryote? Eukaryotes have a membrane bound nucleus, prokaryotes don't. What is a pathogen? something that causes illness. What is pathogenesis? Studying how pathogens causes disease. What is an infectious disease? A disease that is communicable. What do antibodies attach to? Antibodies attach to antigens. What strain of staphylococcus is methicillin resistant? MRSA (staphy...

BI 234 LAB PRACTICAL 1 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED aseptic technique Purpose is to maintain pure culture by avoiding cross contamination & to avoid contaminating lab environment. aseptic technique fails if you contaminate it with unknown bacterium because you can not determine which microbe is responsible for the reaction you observe. It is to protect you & classmates from organisms that could cause disease. Quadrant streak plate technique Purpose: isolate b...