Block 9 Bacterial Genetic Xhange MCQ's
Exchange of genetic material between bacterial species is mediated by the basic processes of conjugation, transduction and transformation. Just how much do you understand about these processes? Take up the block 9 bacterial genetic exchange MCQ`s below and get some practice for the upcoming test. All the best and keep a look out for more quizzes.
- 1.An organism is isolated from urine collected from a patient with a urinary tract infection. This organism is gram-negative bacillus that grows at 37C in room air. It displays a swarming motility. The isolated organism most likely has which of the following biochemical profiles?
- A.
Ferments glucose, but does not ferment lactose
- B.
Ferments glucose and lactose
- C.
Does not ferment glucose or lactose
- D.
Does not ferment glucose but does ferment lactose
- 2.Cultures were collected from a patient. After 48 hours, the cultures were positive, and a Gram stain of the culture revealed large, spore-forming Gram-positive bacilli. To which of the following genera does this organism most likely belong?
- A.
Listeria spp
- B.
Corynebacterium spp.
- C.
Clostridium spp.
- D.
Actinomyces spp.
- E.
Nocardia spp.
- 3.Cultures were collected from a patient. After 48 hours, the cultures were positive, and a Gram stain of the culture revealed large, spore-forming Gram-positive bacilli. which of the following statements best describes organisms that belong to this genus?
- A.
Saprophytic organisms found in the soil or intestinal tract of humans and animals
- B.
Facultative intracellular organisms
- C.
Infection occurs in immunocompromised individuals
- D.
Can be club-shaped or can resemble Chinese letters
- E.
Have a cell wall similar to that of mycobacteria
- 4.Which of the following characteristics does Brucella spp., PasturelIa spp., and Francisella spp., have in common?
- A.
Facultative intracellular organisms
- B.
Fastidious and have special requirements for growth in culture
- C.
Infection is usually associated with contact with animals
- D.
Oxidase negative and ferment glucose
- E.
Pathogens of the human respiratory tract
- 5.Which of the following best describes the structural characteristics of spirochetes?
- A.
Spiral-shaped bacillus with typical Gram-negative cell wall; multiple polar flagella protruding from the cell
- B.
Bacillus with typical Gram-negative cell wall; multiple flagella that are distributed over the entire cell, protruding from the cell
- C.
Helical-shaped bacillus with typical Gram-negative cell wall; multiple flagella in space between inner and outer membranes
- D.
Curved bacillus with typical Gram-negative cell wall; single polar flagella
- E.
Bacillus with typical Gram-positive cell wall, non-motile
- 6.In bacterial cell walls, peptidoglycan (PG) as the major constituent has which of the following properties?
- A.
PG is present in Gram-positive bacteria as well as Gram-negative bacteria, including Chiamydia
- B.
Fragments of PG are toxic and induce cytokines
- C.
PG is comprised of lipid A and 0-polysaccharide
- D.
Vancomycin inhibits PG synthesis by binding to transglycosidase and transpeptidase
- 7.Pseudomonas aeruginosa is a major problem in hospitals and can usually be found growing in the water used for flowers for patients. Which of the following characterizes P. aeruginosa?
- A.
Non motile Gram positive cocci
- B.
Motile Gram positive rods
- C.
Non motile Gram negative cocci
- D.
Motile Gram negative rods
- 8.An outbreak of food poisoning occurs and dairy products are suspected as being contaminated with microorganisms. A sample of unpasteurized milk is sent to the laboratory and the following is discovered: slow growing, Gram-positive bacilli, which are able to grow in tissue culture cells. Which of the following organisms would you suspect?
- A.
E. coil
- B.
Corynebacterium
- C.
Listeria
- D.
Mycobacterium
- 9.If your patient was infected with a Gram positive coccus that was catalase and coagulase positive, which organism would you expect to be the culprit?
- A.
Group A Strep
- B.
Staph. Aureus
- C.
Clostridium perfringens
- D.
Mycoplasma pneumonlae
- 10.Your patient is a 19 year old student who presents with drowsiness, stiff neck and fever. Culture of the patient's blood reveals the presence of encapsulated Gram negative diplococci that can ferment glucose and maltose but not sucrose or lactose. Whch organism was most likely responsible for the patient's condition?
- A.
E. coil
- B.
Treponema pallidurn
- C.
Staph. aureus
- D.
Nelsseria meningitidis
- 11.A major cause of diarrhea is a bacterium with the following characteristics: Gram- negative, comma-shaped bacillus, motile with polar flagella and unable to ferment or oxidize carbohydrates, but is oxidase-positive. Isolation of this organism is improved by incubation of cultures at 42C. What is this bacterium?
- A.
Escherichia coil
- B.
Campylobacter jejuni
- C.
Vibrio cholera
- D.
Helicobacter pylori
- 12.The virulence factor CagA encoded by a specific pathogen is associated with gastric adenocarcinoma. CagA is encoded within a pathogenicity island and transferred into host cells via a Type IV secretion system. Which of the following pathogens encodes CagA?
- A.
Candida albicans
- B.
Escherichia coil
- C.
Streptococcus lactis
- D.
MRSA - methicillin resistant Staphylococcus aureus
- E.
Helicobacter pylori
- 13.In May 2011, an outbreak of foodborne illness, complicated in many cases by hemolytic uremic syndrome, was seen in Germany. In thousands of patients, the causative agent was identified as a Shiga-toxin producing, Gram-negative, oxidase-negative rod that fermented lactose. A novel finding was that the isolates had the serotype O104:H4:K9, indicating that there was a common source for the infection and that it was a pathogen that had not previously been seen. What bacterial structures/components were useful in determining the serotype of this organism?
- A.
Flagella, lipid A, pili
- B.
Histones, peptidoglycan, teichoic acid
- C.
LPS, flagella, capsule
- D.
OMPs, haptens, kinetoplasts
- E.
Pili, transpeptidases, hemolysins
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