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Microbiology Exam 3 Practice Questions
The most common sexually transmitted disease in the US is: A. Herpes B. Syphilis C. Condyloma D. Chlamydiae infections E. Gonorrhoea infections D An enzyme of Staphylococcus aureus that convents fibrinogen into insoluble fibirn is: A. Lipase B. Coagulase C. Staphylokinase D. Hemolycin E. Hyaluronidase B Extra-intestinal disease, especially the production of a serious fever, may follow intestinal infection with: A. Vibrio cholerae B. Salmonella typhi C. Shigella dysenteriae D. Clostridium botulinum E. Staphylococcus aureus B On blood agar, Streptococcus pyogenes causes which type of hemolysis? A. Delta hemolysis B. Alpha hemolysis C. Gamma hemolysis
D.Beta hemolysis E. No hemolysis D S. pyogenes has: A. capsule B. M protein C. Teichoic acid D. All of these D Food poisoning due to which organism is most likely to cause a flaccid muscle paralysis: A. Staphylococcus aureus B. Clostridium perfringens C. Clostridium botulinum D. Bacillus anthracis E. Bacillus cereus C (think Botox!) Pneumococcal pneumonia is often treated successfully by using penicillin. Penicillin inhibits the growth of the pneumococcus by preventing the synthesis of: A. Capsule B. Common pili C. Cell wall D. Cell membrane E. Flagella
D. Encephalitis E. Impetigo D The material that is released from bacteria that may lead to shock and death in septicemia: A. Components of Gram-negative outer membrane B. exotoxin C. Teichoic acid D. Protein A A Edema factor and lethal factors are two characteristics of: A.Neisseria gonorrheae B. Treponema pallidium C. Chlamidiae tracomitis D. Bacillus anthracis E. Staphylococcus aureus D Gas gangrene is the result of deep wound infections in anaerobic tissue by Clostridium perfringens. A. Release of superantigens in the area B. Release of endotoxins by Clostridium C. Sporulation of Clostridium D. Phagocytosis E. Loss of blood supply to the soft tissues
E
Lipopolysaccharide is present in the outer membrane of gram negative bacteria. Which of the following does not apply to this? A. It prevents phagocytosis B. It promotes degranulation of PMN leukoccytes C. It activates complement fixation D. It has antigenic properties E. It produces fever A Gram negative bacteria are usually more resistant to antibiotics than Gram positive bacteria. True False True Both antibiotic treatment and surgical removal are required to treat infections such as: A=Gangrene B=Flesh-eating bacteria C=Tuberculosis D=Gonhorrhea infection A. A and D B. B and C C. C and D D. B and D E. A and B E
B. Alcoholics C. Diabetes D. Capsules surrounding the bacteria E. All of these E A toxin of Staphylococcus aureus that acts as a protease and is responsible for skin damage (mainly in children) is: A. Hydrogen peroxide B. Alpha toxin C. Beta toxin D. Coagulase E. Exfoliative toxin E A major virulence mechanism of Streptococcus pneumoniae is: A. The presence of a capsule B. Production of the enzyme coagulase C. Production of alpha toxin D. Production of beta hemolysin E. The ability to survive within macrophages A Disease caused by Mycobacterium tuberculosis is mainly the results of: A. The reaction of the host defenses to the organism B. The endotoxin associated with the outer membrane of the bacteria
C. The production of enterotoxin D. The production of neurotoxin E. None of the above A (remember Mycobacterium Tb is non-toxic) Cytoskeletal damage, loss of tight junction and mucosal injury are the results of toxins produced by: A. Shigella B. Escherichia C. Streptococci D. Clostridium E. Vibrio D (clostridium difficile) A deep pus-filled lesion caused by Staphylococcus aureus is called A. impetigo B. folicolitis C. furuncle D. Condyloma E. Chancer C The extracellular form of Chlamydia trachomatis that is capable of survival outside of the host and is infectious is the A. Infectious body B. Reticulate body
E. Escherichia coli A (uses the enterotoxin) The M protein of this microorganism is a virulence factor and can be used to classify it into antigenic types. It is: A. Vibrio cholerae B. Staphylococcus aureus C. Streptococcus pyogenes D. Clostridium botulinum E. Escherichia coli C In general, Mycobacteria spp. are more resistant than other vegetative cells to all of the following EXCEPT: A. Drying B. Acid C. Base D. Chemicals (such as phenol) E. Heat E Which of the following is NOT true of diarrhea caused by Shigella Dyenteriae? A. it results in loss of ions B. blood is present in the stool C. the toxin produced is an enterotoxin D. the toxin produced stops the protein synthesis in the host E. it results in loss of tissue
A
All of the following statements about staphylococcal food poisoning are true except A. It can be prevented by refrigeration B. Suspect foods are those not cooked before eating C. Boiling foods for 5 minutes before eating can prevent it D. Replacing water and electrolytes treats it E. It is characterized by rapid onset and short duration of symptoms. C A patient has fever, difficulty breathing, chest pains, fluid in the alveoli, and a positive tuberculin skin test. Gram-positive cocci are isolated from the sputum. The patient most likely has A. Pneumococcal pneumonia B. Common cold. C. Influenza D. Tuberculosis E. Mycoplasmal pneumonia A The symptoms of Cholera are due to the action of: A. Exotoxins B. Endotoxins C. Flagella D. Pili A Which of the following statements about the alpha toxin of Staphylococcus aureus are true? A. It may be responsible for some of the tissue damage that occurs during infection
E. Enterotohemorrhagic EC A Clostridium botulinum produces a toxin that prevents release of the neurotransmitter acetylcholine leading to flaccid paralysis True False True Eye infections leading to blindness may follow birth of infants to mothers infected with: A. Neisseria gonorrhoeae B. Escherichia coli C. Streptococcus pyogenes D. Mycobacterium tuberculosis E. Chlamydia trachomatis A (chlamydia can also cause eye infections... just didnt mention blindenss) Eye drops containing silver nitrate or antibiotics are used to treat newborn babies to prevent blindness caused by infection with: A. Mycobacterium tuberculosis B. Neisseria gonorrhoeae C. Mycobacterium leprae D. Streptotoccus pneumoniae E. Streptococcus pyogenes B Which of the following is an enterotoxin? A. Cholera toxin B. Lipopolysaccharide
C. Diphtheria toxin D. Botulinum toxin E. Tetanus toxin A Some people may carry an infectious agents for years without showing any symptoms. These people shed the infectious agent on a regular basis and are a significant risk to others who come in contact with them. These people, also called chronic carriers, normally carry the pathogens in their: A. Illume B. Small intestine C. Large intestine D. Gal bladder E. Duodenum D Symptoms of bacterial meningitis includes a- stiff neck b- tightening of jaw and neck c- vomiting d- difficulty breathing e- severe headache A. a and e B. a, b and c C. a, c, d, and e D. a, c and e E. all of the above D Part of the ability of germs to produce dental caries depends on their ability to: A. Convert sucrose to lactic acid
D. Neisseria gonorrhoeae E. Vibrio cholerae D Which of the following is true of the elementary body of Chlamydia trachomatis? A. It is the extracellular, infectious form B. It is relatively permeable to metabolites and nutrients C. The RNA/DNA ratio is approximately 3 D. It is sensitive to sonication E. All of the above A A toxin produced by Staphylococcus aureus that causes the "scalded-skin" syndrome is: A. Coagulase B. Alpha toxin C. Beta toxin D. Exfoliative toxin E. Erythrogenic toxin D The transferrin binding proteins and the lactoferrin binding proteins of Neisseria gonorrhea help the bacteria to: A. Obtain protein B. Obtain iron C. Evade the effects of antibody D. Evade phagocytosis
E. Attach to susceptible cells B Hemolytic anemia and acute renal failure may be consequences of infection with: A. Salmonella typhi B. Streptococcus pyogenes C. Escherichia coli D. Staphylococcus aureus E. Vibrio cholerae C Besides being an intracellular parasite, this microorganism is also an "energy parasite" that doesn't produce its own high-energy phosphate compounds. It is: A. Neisseria gonorrhoeae B. Mycobacterium tuberculosis C. Mycobacterium leprae D. Chlamydia trachomatis E. None of the above D The disease called "walking pneumonia" is caused by: A. Mycoplasma pneumoniae B. Klebsiella pneumoniae C. Treponema pallidum D. Streptococcus pneumoniae E. None of the above A
a. Mycoplasma pneumoniae b. Mycobacterium tuberculosis c. Streptococcus pyogenes d. Salmonella typhimurium A. b and d B. a and b C. None of the above D. a only E. d only A Which of the following is a MISMATCH? A. Clostridium====Skin infection B. Clostridium====Alpha toxin C. All match correctly D. Anthrax=====Zoonotic disease E. LT toxin=====ETEC C Coliforms are: A. Gram negative rods B. All of these C. Indicator organisms D. Pathogenic microbes E. They ferment lactose B Chlamydia is a fastidious organism, and grows under laboratory conditions in media supplemented with elaborate and complex nutrients True False False
Which of the following is NOT TRUE of leprosy? A. No vaccine is avaialble for the diseases B. It is caused by intracellular parasitic bacteria C. Necrosis and loss of tissue is caused by the toxin produced by the microorganism D. There is no cure for it E. There are two forms of the disease C (it is non-toxic) Vibrio cholerae causes Cholera. The characteristics of the toxin produced by this microorganism do not include the following A. It increases cAMP level B. Its an exotoxin C. Its a protein D. It inhibits protein synthesis E. Its an enterotoxin D Consuming raw oyster could probably transmit A. Escherichia coli B. Staphylococcus aureus C. Streptococcus pyogenes D. Vibrio cholera E. Salmonella typhi D Streptococcus spp. are classified as alpha, beta or gamma based on their: A. Hemolysis pattern on blood agar B. Activity on biochemical tests C. Differences in their C-reactive carbohydrate D. Differences in their C-reactive protein E. Number and types of plasmids A Salpingitis is infection of : A. Cervix B. Vagina C. Uterus
