31. Which of the following type of antibiotics acts through competitive inhibiti

Question

31. Which of the following type of antibiotics acts through competitive inhibition, t metabolic pathways? affecting b. penicillins d. cephalosporins 32. What drug disrupts the cell membranes of fungal cells by associating with sterol molecules? a. Cefazolin b. Amphotericin B c. Aztreonam d. Bacitracin 33. What type of drug is used to treat methicilli resistant Staphylococcus aureus (MRSA)? a. Quinolones b. Fofsomycin trimethanine c Oxazolidinones d. Flucytosine 34. When identifying an unknown bacterium, what staining method would you use first? a. Gram stain b. Spore stain c. Negative stain d. Capsular stain 35. There are many tests utilizing different types of media that are used to identify an unknown bacterium. What can these tests tell you about the unknown organism? a. b. c. d. What type of respiration the organism undergoes Whether the bacteria have cellular structures for motility What type of metabolic processes the bacteria undergoes All of these 36. What temperature is optimal for most bacteria that cause infections? a. 4C b, 25C e. 30C d. 37C 37. The temperature/pressure combination used in an autoclave is a. b. c. d. 100C and 4psi 121C and 15 psi 131C and 9psi 115C and 3psi 38. Pathogenicity is a concept that describes the organisms ability to a. b. c. d. Cause an infection Survive Insert its genome into the DNA sequence of another organism multiply

Explanation / Answer

31. Option A is correct.

Sulfonamides are structural analogs of para-aminobenzoic acid. They act as competitive inhibitors of the folic acid pathway and inhibit bacterial growth.

32. Option B is correct.

Amphoterin is a toxic fungal drug that increases the permeability of the cell membrane.

33. Option C is correct.

Oxazolidinones such as Linezolid are used in MRSA treatment.

34. Option A is correct.

The gram staining is the first staining method for identifying/characterizing an unknown bacterium.

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