Which is more impervious to the action of antimicrobial chemicals? Multiple choice question.
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Antimicrobial chemicals are substances that can kill or inhibit the growth of microorganisms such as bacteria, viruses, and fungi. Show more…
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A certain disinfectant has a 6-log killing power against E.coli. Your initial concentration of bacteria is 6.0x10^9 cfu/mL. What concentration of E.coli will you end up with after applying the disinfectant above? A) 1.0 x 10^9 cfu/mL B) 6.0 x 10^3 cfu/mL C) 6.0 x 10^15 cfu/mL D) 1.0 x 10^3 cfu/mL E) 3.6 x 10^8 cfu/mL 2. What is the mechanism of action of tetracyclines: A) Inhibition of DNA transcription B) Prevent a peptide bond formation in the growing polypeptide chain C) Inhibit the synthesis of DNA precursors D) Inhibition of DNA replication E) Block the attachment of the amino acid-carrying tRNA to the 30S subunit of the ribosome 3. Biguanides are: A) Sporicidal B) Non-sporicidal 4. The concentration of your overnight E.coli culture happens to be 4.5x10^7 cfu/mL. You were asked to achieve 300 colonies with a pour-plate method. At some point in your dilution schedule you will have to perform the following dilution: A) 3mL of culture and 4.5mL of buffer B) 3mL of culture and 1 mL of buffer C) 4.5mL of culture and 3 mL of buffer D) 3mL of culture and 1.5mL of buffer E) none of the above 5. A bacterial sample was serially diluted according to the following dilution schedule: 1ml culture + 5ml diluent, 0.7ml of the last dilution + 6.3ml of diluent, 1.5 ml of that dilution + 4.5ml diluent. What is the dilution factor? A) 300 B) 100 C) 240 D) 150 E) 200 6. Which type of antibiotic is better at promoting resistance of bacteria: A) Narrow-spectrum B) Natural C) Synthetic D) Broad-spectrum E) Semisynthetic 7. What is the mechanism of action of macrolides: A) Inhibition of DNA transcription B) Prevention of peptide bond formation in the growing polypeptide chain C) Inhibition of synthesis of DNA precursors D) Inhibition of DNA replication E) Block the attachment of the amino acid-carrying tRNA to the 30S subunit of the ribosome 8. The process/modification of the antibiotic that generally improves its spectrum of activity, effectiveness, and reduces host toxicity is known as: A) Semisynthesis B) Isomerization C) Potentiation D) Purification E) Neutralization 9. Is Hydrogen peroxide (H2O2) sporicidal? A) Yes, at visually any concentration B) Not sporicidal at any concentration C) Depends on the concentration of peroxide. Sporicidal at 10~30% and higher 10. Which of the antimicrobials below uses the highest concentration of the active ingredient in its formulation: A) Disinfectant B) Preservation C) Antiseptic D) Antibiotic E) None of the above
Adi S.
QUESTION 13 Drug resistance occurs because bacteria are normal microbiota when antibiotics are used indiscriminately against bacteria and not against synthetic chemotherapeutic agents when antibiotics are taken after the symptoms disappear all of the above QUESTION 14 In what way are semisynthetic penicillins and natural penicillins alike? Both are broad spectrum Both are resistant to penicillinase Both are resistant to stomach acids Both are bactericidal Both are based on β-lactam QUESTION 15 Which of the following substances is the LEAST effective antimicrobial agent? soap cationic detergents phenolics iodine alcohol QUESTION 16 Which of the following statements is CORRECT with regard to aminoglycosides? examples include streptomycin and neomycin they cause inhibition of protein synthesis toxicity may damage the kidneys and auditory nerve all the above are true QUESTION 17 Which of these antimicrobial agents has potentially the fewest and least dangerous side effects? (Do not consider an individual with an allergy to any of these substances) Streptomycin Tetracycline Penicillin Erythromycin Chloramphenicol QUESTION 18 Protozoan and helminthic diseases are difficult to treat because Their cells are structurally and functionally similar to human cells They don't have ribosomes They don't reproduce None of the above QUESTION 19 Which concentration of ethyl alcohol is the most effective bactericide? 100% 70% 30% 7% QUESTION 20 Which of the following antimicrobial agents is recommended for use against fungal infections? Amphotericin B Bacitracin Cephalosporin Penicillin QUESTION 21 Which of the following is not a common mechanism by which antimicrobial agents kill or inhibit the growth of bacteria? damage to cell membranes destruction of capsules inhibition of cell wall synthesis inhibition of nucleic acid synthesis (either DNA or RNA) inhibition of protein synthesis QUESTION 22 Which of the following is used as a surgical hand scrub? phenol chlorine bleach chlorohexidine soap glutaraldehyde
Sri K.
9.) In evaluating disinfectant effectiveness, the use-dilution method involves which of the following methods of assessment? a.) zone of inhibition b.) two of these are correct c.) clearing zones surrounding discs d.) turbidity 10.) Which of the following is/are true of ethanol as a disinfectant? a.) two of these are correct b.) 70% ethanol is more effective than 91% ethanol c.) 91% ethanol evaporates quickly and reduces time of exposure d.) 91% ethanol is more effective than 70% ethanol 11.) Some chemical agents form micelle structures to carry away insoluble substances in water. Which of the following are capable of forming micelles? a.) Benzalkonium chloride b.) halogens c.) two of these are correct d.) detergent 12.) Which of the following is/are true of hypochlorites (ClO-)? a.) it is classified as a halogen agent b.) it is used to denature proteins c.) all of these are true d.) it is the active ingredient in household bleach
Dominador T.
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