151- 200 Micro Para

151. Which of the following statements is NOT true regarding transduction? A. It is more reproducible than transformation B. Some bacteriophages mediate generalized transduction C. It is less reproducible than transformation D. Some bacteriophages mediate specialized transduction 152. Which of the following diseases is NOT caused by Streptococcus pyogenes? A. Acute tonsillitis & pharyngitis B. Pyogenic meningitis C. Puerperal sepsis D. Food poisoning 153. Which of the following statements is TRUE regarding inclusion bodies that are produced in the course of viral replication within cells? A. May be situated either in the nucleus or cytoplasm but not in both B. Are never larger than the individual virus particle C. Never consist of masses of virus particles D. Can be of diagnostic value 154. Which of the following bacteria is a capsulated gram-positive diplococci? A. Gonococci B. Pneumococci C. Streptococcus pyogenes D. Klebsiella pneumonia 155. Which of the following infections is the MOST serious threat in a bone transplant unit? A. Aspergillosis B. Candidiasis C. Tinea corporis infection D. Histoplasmosis 156. Which of the following is the complement component that promotes opsonization? A. C3e B. C4 C. C3b D. C2 157. Which of the following statements is NOT true about pneumococci? A. Can cause lobular pneumonia B. Produce hemolysis on blood agar C. Are bile soluble D. Are mobile 158. The pathology of protozoal diseases is MAINLY due to: A. Protracted diarrhea B. Hypersensitivity reaction C. Tissue lysis D. Toxins

159. Neisseria gonorrheae are BEST grown in: A. Blood agar B. Chocolate agar C. MacConkey’s agar D. Nutrient agar 160. Most bacteria will form visible colonies after incubation for: A. 2-4 hours B. 18-48 hours C. 4-8 weeks D. 48-72 hours 161. Which part of the adult female genital tract is usually NOT involved in gonorrhea? A. Cervix uteri B. Fallopian tubes C. Endometrium D. Vaginal mucosa 162. Which of the following is NOT a DNA virus? A. Measles virus B. Adenovirus C. Variola virus D. Smallpox virus 163. Which of the following statements is NOT true regarding C. diphtheriae? A. Some strains produce powerful exotoxin B. They are gram-positive bacilli C. They are not motile D. Can grow on nutrient agar 164. Which of the following organisms is NOT considered a cause of systemic mycoses? A. Sporothrix schenkii B. Histoplasma capsulatum C. Paracoccidioides brasiliensis D. Coccidioides immitis 165. Which of the following statements is the MOST suitable medium for the growth of C. diphtheria in 6-8 hours? A. Potassium-tellurite blood agar B. Blood agar C. Nutrient agar D. Loeffler’s serum slope 166. Cell-mediated immunity is a function of: A. T-cell B. B-cell C. NK cell D. Mast cell

167. Which of the following is the MOST common site of infection by C. diphtheriae? A. Conjunctiva B. Fauces C. Genitalia D. Larynx 168. Which of the following is NOT a protozoan? A. P. caninum B. Ureaplasma C. T. vaginalis D. Giardia 169. Which of the following statements is NOT true regarding Bacillus anthracis? A. Medusa head colonies are seen on agar medium B. Spores are resistant to boiling C. Need anaerobic atmosphere for growth D. First discovered by Robert Koch 170. Which of the following is a ciliated intestinal protozoan which may infect man? A. Naegleria spp B. Blastocystis hominis C. Balantidium coli D. Acantamoeba spp 171. Wool-Sorter’s disease involving the lung is caused by: A. Filamentous fungi B. B. anthracis C. S. aureus D. K. pneumonia 172. Most microorganisms have a fairly narrow optimal pH range. Hence, they are known as: A. Neutrophils B. Acidophils C. Heterphils D. Autotrophs 173. All of the following are caused by Clostridium welchii, EXCEPT: A. Food poisoning B. Gas gangrene C. Anaerobic cellulitis D. Malignant pustule 174. Which of the following statements is a DNA virus? A. Arenavirus B. Togavirus C. Hepatitis A virus D. Parvovirus 175. Slender bacilli with round terminal spores are characteristics of which clostridium? A. C. septicum

B. C. Botulinum C. C. tetani D. C. welchii 176. Cell-mediated immune responses are: A. Suppressed by cortisone B. Enhanced by depletion of T-cells C. Enhanced by depletion of complement D. Suppressed by antihistamines 177. Which of the following bacteria does NOT produce a powerful exotoxin? A. Cholera vibrio B. Salmonella typhi C. Corynebacterium diphtheriae D. Clostridium botulinum 178. Which of the following causes abdominal pain and severe diarrhea? A. T. gondii B. Cryptosporidium sp C. P. canini D. All of the above 179. DPT vaccine protects the child against all of the following diseases, EXCEPT: A. Diphtheria B. Whooping cough C. Pneumococcal pneumonia D. Tetanus 180. Which of the following is the term used to describe the exchange of allelic forms of genes in bacteria or eukaryotic cells? A. Transcription B. Translation C. Recombination D. Transduction 181. Which of the following statements is NOT true about Clostridium tetani? A. Widely distributed in soil & intestine of man & animals B. Produce swarming growth on moist blood agar under anaerobic conditions C. Are motile by peritrichate flagella D. Are capsulated 182. An ameba whose motility is active, progressive, and directional is present in: A. Entamoeba coli B. Entamoeba histolytica C. Balantidium coli D. Giardia lamblia 183. Which of the following statements is NOT true about the T-cells? A. Are responsible for humoral immunity B. Are widely dispersed throughout the body

C. Many are found in the lymph nodes D. Are responsible for cell-mediated immune response

184. Which of the following statements is NOT true about the tetanus toxin? A. Is produced locally at the site of infection & transported to CNS along the peripheral nerves B. Toxin acts by specifically blocking synaptic inhibition in the spinal cord C. Is heat stable and cannot be toxoided D. Is specifically neutralized by antitoxin

185. Flagellated protozoa that cause gastroenteritis in humans include which of the following? A. Trichomonas vaginalis B. Balantidium coli C. Giardia lamblia D. Entamoeba histolytica 186. Which of the following clostridium species is MOST commonly associated with antibiotic-associated colitis? A. C. welchii B. C. edematiens C. C. difficile D. C. septicum 187. The production of progeny virus that carries traits NOT found together in either parent is the result of: A. Homologous interference B. Complementation C. Recombination D. Heterologous interference 188. Which of the following statements is NOT true about Bacteroides spp.? A. Are facultative anaerobes B. Are gram-negative bacilli C. Are non-sporing D. Are sensitive to Metronidazole 189. Which of the following cells are involved in immune surveillance against tumors that are not antibody-mediated? A. Helper T-cells B. NK cells C. Suppressor T-cells D. Cytotoxic T-cells 190. Which of the following is the drug of choice for the treatment of infection by anaerobes? A. Penicillin B. Metronidazole

C. Polymixin D. Gentamicin 191. The association between Entamoeba coli and man is known as: A. Mutualism B. Parasitism C. Commensalism D. Symbiosis 192. Which of the following statements is NOT true about bacteria belonging to the family Enterobacterociaceae? A. Are all gram-negative bacilli B. Are all motile with peritrichate flagella C. Are all glucose-fermenting with the production of acid D. Are all capable of reducing nitrates to nitrites 193. What is the optimum pH for growth of most bacteria? A. 5.5 - 6.5 B. 7.2 - 7.6 C. 8.0 - 9.2 D. 9.2 - 10.0 194. Which of the following bacteria if present in a water sample would indicate fecal contamination of recent origin? A. Klepsiella spp B. Clostridium welchii C. Escherichia coli D. Pseudomonas aeruginosa 195. During the latent period of the virus growth cycle, which of the following events does NOT happen? A. Replication of the viral genome B. Synthesis of the viral RNA C. Production of extracellular virions D. Synthesis of capsid protein 196. Which of the following bacteria are MOST commonly responsible for urinary tract infection? A. Klebsiella species B. Escherichia coli C. Proteus vulgaris D. Streptococcus faecalis

197. Which of the following are thymic lymphocytes that recognize an antigen and interfere with the development of a humoral immune response? A. Suppressor T-cells

B. Null cells C. Helper T-cells D. Killer cells 198. Which of the following statements is NOT true about Shigella sonnei? A. Causes the mildest form of dysentery B. Has been classified into 17 colicine types C. Is a late lactose fermenter D. Is motile 199. The mature cyst of Entamoeba coli contains: A. 2 nuclei B. 6 nuclei C. 4 nuclei D. 8 nuclei 200. All of the following clinical diseases are caused by the salmonella group of organisms, EXCEPT: A. Enteric fever B. Septicemia C. Gastroenteritis D. Puerperial sepsis