MCQOPTIONS
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MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Bacillus knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Clostridium perfringens toxins are released only after entering the host cell through wounds or from the intestinal tract, which of the following also known as the alpha toxin can damage the cell membranes ultimately resulting in hemolysis and tissue destruction? |
| A. | Lecithinase |
| B. | Enterotoxin |
| C. | Alpha |
| D. | Beta |
| Answer» B. Enterotoxin | |
| 2. |
All of the following are the preventive measures for Tetanus, EXCEPT |
| A. | Active immunization of toxoids |
| B. | Prophylactic use of antitoxin |
| C. | Administration of Bacitracin |
| D. | All of the above |
| Answer» D. All of the above | |
| 3. |
Clostridium botulinum associated foodborne illness may occur within 18-24 hours of ingestion of a food containing the bacterial toxin. Which of the following are NOT the common symptoms of the illness? |
| A. | Poor vision |
| B. | Fever |
| C. | Difficulty swallowing |
| D. | Bulbar paralysis |
| Answer» C. Difficulty swallowing | |
| 4. |
Which of the following is the most correct general characteristic of Clostridia spp |
| A. | Grows well in Nutrient agar |
| B. | Produce alpha-hemolytic colonies |
| C. | Grows in aerobic conditions |
| D. | Produces neurotoxins |
| Answer» E. | |
| 5. |
Bacillus cereus secretes.........................in the intestines and cause foodborne illness in humans |
| A. | Cytotoxins |
| B. | Neurotoxins |
| C. | Enterotoxins |
| D. | Pneumolysin |
| Answer» D. Pneumolysin | |
| 6. |
All of the following statements about Bacillus anthracis are true, EXCEPT |
| A. | Form hemolytic colonies on blood agar |
| B. | Causes severe infections in animals |
| C. | A non-motile gram-positive rod |
| D. | It consists of the capsule |
| Answer» B. Causes severe infections in animals | |
| 7. |
Name the most potent toxin produced by Clostridium botulinum and C.tetani |
| A. | Aflatoxin |
| B. | Exotoxins |
| C. | Cytotoxin |
| D. | Neurotoxin |
| Answer» E. | |
| 8. |
The AVA BioThrax is the FDA approved vaccine for |
| A. | Bacillus cereus |
| B. | Clostridium tetani |
| C. | Bacillus anthrax |
| D. | Bacillus substilis |
| Answer» D. Bacillus substilis | |
| 9. |
Select the correct answers, other than food poisoning what other clinically important types of diseases are caused by Clostridium perfringens? |
| A. | Gas gangrene |
| B. | Impetigo |
| C. | Cellulitis |
| D. | Toxic shock syndrome |
| Answer» B. Impetigo | |
| 10. |
Which of the following species of Clostridia do not have flagella, but rapidly grows on nutrient media and mimics the growth of motile organisms? |
| A. | Clostridium botulinum |
| B. | Clostridium perfringens |
| C. | Clostridium tetani |
| D. | Clostridium difficile |
| Answer» C. Clostridium tetani | |
| 11. |
Bacillus cereus causes two types of foodborne intoxications, known as the emetic type and diarrheal type of infections. Which of the following is the approximate time period for the symptoms to appear after the ingestion of contaminated food? |
| A. | 1-12 hours |
| B. | 1-2 days |
| C. | 1-5 hours |
| D. | 1-24 hours |
| Answer» D. 1-24 hours | |
| 12. |
Bacillus .......is a common laboratory contaminant and is used for sterility testing. It is an endospore-forming bacteria and resistant to extreme environmental conditions. |
| A. | subtilis |
| B. | thermophilus |
| C. | cereus |
| D. | agalactiae |
| Answer» B. thermophilus | |
| 13. |
Bacillus anthracis is a medically important spore-forming rod that may cause the disease "anthrax" in animals and humans. What are the two important virulence factors of this organism? |
| A. | Capsule and enterotoxins |
| B. | Exotoxins and enterotoxins |
| C. | Endotoxins and capsule |
| D. | Capsule and exotoxins |
| Answer» E. | |
| 14. |
Most of the species of Bacilli and Clostridia are.............., which means they obtain their nutrients from dead or organic matter. |
| A. | Parasites |
| B. | Saprophytes |
| C. | Symbiotic |
| D. | Mutualistic |
| Answer» C. Symbiotic | |
| 15. |
Bacillus.............is commonly found in soil and is an insect pathogen that can infect humans also. It is often used in the production of insecticidal products. |
| A. | thuringiensis |
| B. | subtilis |
| C. | anthracis |
| D. | cereus |
| Answer» B. subtilis | |
| 16. |
Which one of the following Bacillus spp is Not commonly isolated pathogenic bacteria? |
| A. | Bacillus cereus |
| B. | Bacillus thuringiensis |
| C. | Bacillus thermophilus |
| D. | Bacillus anthracis |
| Answer» D. Bacillus anthracis | |
| 17. |
All of the following are the cultural characteristics of Bacilli spp, Except |
| A. | Anaerobes |
| B. | Gram-positive |
| C. | Spore-forming |
| D. | Ubiquitous |
| Answer» B. Gram-positive | |
| 18. |
Which is the most common food associated with infant botulism? |
| A. | Maple syrup |
| B. | Honey |
| C. | Canned baby food |
| D. | Corn syrup |
| Answer» C. Canned baby food | |
| 19. |
.........................can cause infections in humans through a puncture wound and ultimately enter the central nervous system by releasing a potent toxin known as neurotoxins, thus blocking the release of neurotransmitters and resulting in cramping of muscles, causing loc jaw and other muscle-related spasms. |
| A. | Bacillus anthracis |
| B. | Clostridium botulinum |
| C. | Clostridium tetani |
| D. | Bacillus subtilis |
| Answer» D. Bacillus subtilis | |
| 20. |
The microscopic identification of the shape and position of spores in a bacteria is a routine laboratory identification method. Clostridium perfringens forms subterminal spores whereas Clostridium...................... forms terminal spores. |
| A. | tetani |
| B. | botulinum |
| C. | cereus |
| D. | None of the above |
| Answer» B. botulinum | |
| 21. |
Food most often associated with emetic type of food poisoning caused by Bacillus cereus, is |
| A. | Meat |
| B. | Rice |
| C. | Milk |
| D. | Eggs |
| Answer» C. Milk | |
| 22. |
Antibodies to which of the following antigens of Bacillus anthracis are protective? |
| A. | Capsular polypeptide |
| B. | Somatic polysaccharide |
| C. | Anthrax toxin |
| D. | None of these |
| Answer» D. None of these | |