هذي واللي قبلها عن مادة البكتيريا
1- …………….. cause acute epiglottitis which may cause fatal airway obstruction.
a- Haemophilus influenza.
b- Strep. pneumonia.
c- Klebsiella pneumonia.
d- Chlamydia.
2- During Satellitism test ………….. grow on blood agar by the help of the growth of Staph.aureus.
a- Haemophilus influenzae.
b- Strep. pneumoniae.
c- Klebsiella pneumoniae.
d- Chlamydia.
3- Although Mycobacteria do NOT accept Gram stain they have …………… cell wall.
a- Gram positive.
b- Gram negative.
c- Gram variable.
4- Why Mycobacteria staining technique (ZN) requires heating as a dye mordent ?
a- Because their cell walls contain large amount of fat.
b- Because of their waxy surface.
c- Because they always have a thick capsule.
d- A and B.
5- Most strains of Mycobacteria need an incubation period of ……. to grow and form their significant characteristics.
a- Up to 3 weeks.
b- 4-8 weeks.
c- 2 days.
d- Overnight.
6- Which of the following cause diseases transmitted to human by an insect vector?
a- Mycoplasma.
b- Rickettsia..
c- Chlamydia.
d- All the above.
7- Rickettsia species cause …………………..
a- Typhus.
b- Scrub typhus.
c- Rocky mountain spotted fever.
d- All the above.
8- …………. are the smallest prokaryotes capable of extracellular self reproduction.
a- Mycoplasma.
b- Rickettsia..
c- Chlamydia.
d- All the above.
9- ……….. have a poorly gram negative staining cell membrane, but do not have a cell wall.
a- Mycoplasma.
b- Rickettsia..
c- Chlamydia.
d- All the above.
10- Large gram +ve non-motile rods, spore forming and capsulated are ……………………..
a- Haemophilus influenzae.
b- Yersinia pestis.
c- Clostridium tetani.
d- Bacillus anthracis.
11- Gram +ve rods appear in clusters like Chinese letters ……………………….
a- Strep. pneumoniae.
b- Campylobacter jejuni.
c- Corynebacterium diphtheriae.
d- Clostridium tetani.
12- C. diphtheriae grow rapidly on ……….. producing significant growth and characteristic morphological feature (granules formation).
a- Loffler serum medium.
b- Dorset egg medium.
c- Blood agar.
d- A & B.
13- Microbes that colonize the human body during birth or shortly thereafter, remaining throughout life are referred to as …………………..
a- Normal flora.
b- Pathogens.
c- Indigenous microbiota.
d- A & C.
14- Normal flora of the skin are concentrated in which of the following regions ……………………….
a- Moist areas.
b- Between the toes.
c- Groin.
d- All the above.
15- The highest number of normal flora is located in which site of the digestive system ?
a- Stomach.
b- Small intestine.
c- Bile duct.
d- Colon.
16- Which of the following part of the body remains sterile ( free from any microbe) ?
a- Mouth.
b- Nose.
c- Brain.
d- Urinary tract.
17- Gram positive bacterium can cause life threatening disease in hospital patients through forming biofilms along catheters and other invasive medical devices and enters bloodstream causing systemic infection is …..
a- Staphylococcus epidermidis.
b- Propionibacterium acnes.
c- Staphylococcus aureus.
d- Streptococcus mutans.
18- Gram positive bacterium, one of the nose normal flora, major cause of surgical wound infection and often referred to as MRSA …………………………
a- Staphylococcus aureus.
b- Streptococcus mutans.
c- Staphylococcus epidermidis.
d- Propionibacterium acnes.
19- Which of the following bacteria have the ability to grow on biofilms on the surface of teeth (plaque) and cause dental decay (caries) ?
a- Streptococcus mutans.
b- Propionibacterium acnes.
c- Staphylococcus epidermidis.
d- Helicobacter pylori.
20- Removal of Streptococcus mutans from oral microflora result in increased growth of ……………… and hence an increased risk of contracting pneumonia.
a- Staphylococcus aureus.
b- Helicobacter pylori.
c- Streptococcus pneumonia.
d- Staphylococcus epidermids.
21- The only organism that has been discovered living in the human stomach in a highly acidic environment (pH 1-2) is …………………………
a- Helicobacter pylori.
b- Campylobacter.
c- Lactobacillus.
d- Bacteroides.
22- Microbial growth in cultures is demonstrated by ……………….
a- Turbidity.
b- Gas formation.
c- Colonies formation.
d- All the above.
23- Identification of bacteria can be achieved through ……………..
a- Growth characteristics.
b- Colony appearance.
c- Microscopic morphological characters.
d- All of the above.
24- Buffered Glucose Peptone water à Fermentation of Glucose à …….… + Methyl red à Red color +ve result. ** Complete **
a- Acid.
b- Base.
c- Salt.
d- Citrate.
25- Which of the following bacteria is Gram positive rods obligatory anaerobic ?
a- Bacillus.
b- Niesseria.
c- Clostridia.
d- Mycobacteria.
26- Which of the following bacteria cause pyogenic meningitides ?
a- Staphylococcus aureus.
b- Streptococcus mutans.
c- Niesseria gonorrhoeae.
d- Niesseria meningitides.
27- Staphylococcus aureus grows on Mannitol salt agar forming yellow colonies due to …..
a- Salt degradation.
b- Agar liquefaction.
c- Mannitol fermentation.
d- CO2 production.
28- Which of the following bacteria are coagulase positive ?
a- Staph. aureus.
b- Staph. saprophiticus
c- Staph. epidermids
d- All the above.
29- Staph. aureus ……………..
a- Aerobic gram positive cocci arranged in clusters.
b- Grow on MacConkey agar producing pink colonies.
c- Grow on Mannitol salt agar producing yellow colonies.
d- All the above.
30- In case of alpha haemolysis on blood agar, colonies are surrounded by ………………
a- Greenish zone.
b- Colorless zone.
c- Yellowish zone.
d- Blue zone.
31- Bacteria which cause complete degradation of hemoglobin and produce colonies surrounded by clear zone on blood agar are referred to as ……………………
a- Alpha hemolytic bacteria.
b- Beta hemolytic bacteria.
c- Gamma hemolytic bacteria.
d- None of the above.
32- Pneumococci form part of the normal microbial flora of …………….. .
a- Moth.
b- Skin.
c- Colon.
d- Upper respiratory tract.
33- Strep. pneumoniae growth on Chocolate agar is enhanced when ………………….
a- Incubated in Carbon dioxide enriched atmosphere.
b- Incubated anaerobically.
c- Incubated at 42 C.
d- None of the above.
34- EaggEC [Enteroaggregative E.coli] causes ……………………….
a- Watery diarrhea.
b- Dysentery (similar to Shigellosis).
c- Chronic diarrhea mainly in children.
d- All the above.
35- E.coli grow on MacConkey agar producing ……………………
a- Yellow colonies.
b- Pink colonies.
c- Brown colonies.
d- Colorless colonies.
36- Best sample for diagnosing enteric fever during the 3rd week is (are) …………………
a- Blood.
b- Faeces.
c- Urine.
d- Sputum.
37- H2S producing Salmonella species grow on XLD agar forming ………………………
a- Pink-red colonies.
b- Pink-red colonies with black centers.
c- Black colonies.
d- Mercury drop colonies.
38- Which of the following bacterium is Gram –ve rods motile oxidase –ve and H2S +ve ?
a- Shigella.
b- Vibrio.
c- Pseudomonas.
d- Salmonella.
39- Widal test is a serological technique which tests for the presence of ………….. in a patient's serum.
a- Salmonella antibodies.
b- Salmonella surface antigens.
c- Salmonella exo-toxins.
d- Antibodies for Salmonella toxins.
40- Widal test is of a great diagnostic importance in case(s) of …………………….
a- Typhoid fever.
b- Paratyphoid fever.
c- Food poisoning.
d- A & B.
1- In oxidation-fermentation test fermentative bacteria utilize carbohydrate in ………….
a- The sealed tube only.
b- The open tube only.
c- Both open and sealed tubes.
d- Neither open nor sealed tube.
2- Urease enzyme catalyze the break down of urea to give ……. Which raise pH (Alkaline)
a- Acetic acid.
b- Ammonia.
c- Hydrogen peroxide.
d- Sodium hydroxide.
3- In urease test the organism is cultured in a medium which contains urea and the indicator …….
a- Phenol red.
b- Ferric chloride.
c- Bromothymol blue.
d- Neutral red.
4- The principle of Methyl red test is …………………..
a- The ability of Enterobacteria to ferment sucrose.
b- The ability of Enterobacteria to ferment glucose with production of acid.
c- The ability of Enterobacteria to ultiliza ammonia.
d- The ability of Enterobacteria to hydrolyze urea.
5- Catalase test is used to differentiate ………………..
a- N. gonorrhoeae from N. meningitides.
b- Staphylococcus from Streptococcus.
c- S. pneumonia from other streptococcus.
d- Salmonella from Shigella.
6- During catalase test we should avoid using media that contain ……… in order not to get false positive result.
a- Red blood cells.
b- Hydrogen peroxide.
c- Glucose.
d- Lactose.
7- ………….. àCatalaseà H2 + O2
a- H2O
b- H2O2
c- H3O2
d- OH
8- Coagulase test is used to confirm ……………………
a- Staphylococcus aureus.
b- Streptococcus pneumonia.
c- Staphylococcus epidermidis.
d- Staphylococcus saprophyticus.
9- C. diphtheriae characterized by ……………..
a- Formation of Voluntin granules.
b- Appear like Chinese letters under LM.
c- Infect young children forming psudomembrane at the throat.
d- All the above.
10- Which of the following bacteria are motile at (18-22 Co) BUT non-motile at (35-37 Co)?
a- Vibrio cholerae.
b- Pseudomonas aeruginosa.
c- Campylobacter jejuni.