1. What is the resulting zone of inhibition if antimicrobial disks were implanted 20 minutes after inoculation? A. larger than the true value B. true value C. smaller than the true value D. cannot be determined 2. Aside from blood agar, which culture medium enables the observation of hemolytic property of Staphylococcus aureus? A. Mannitol agar medium B. Colistin-Nalidixic acid agar C. Vogel-Johnson Medium D. Phenylethyl alcohol agar 3. Which of the following primary culture media gives growth advantage to Group D Streptococci from fecal specimens? A. Blood agar media B. Colistin Nalidixic acid C. Chocolate agar D. Phenylethyl alcohol plate 4. Test that differentiates Moraxella from gonococci is: A. catalase test B. oxidase test C. superoxol test D. penicillin disk test 5. Which of the following are not supported by unsupplemented chocolate agar? A. N. gonorrhoeae and N. meningitidis B. N. meningitidis and N. mucosa C. N. mucosa and N. lactamica D. N. gonorrhoeae and N. lactamica 6. Which is the preferred transport system for cotton swab collected genital specimen suspected with pathologic Neisseria? A. Semisolid media with activated charcoal B. Apotex semisolid C. Stuart's semisolid D. Amie's buffered semisolid
Added by Kathleen P.
Step 1
Step 1: The zone of inhibition is the area around the antimicrobial disk where bacteria do not grow. Show more…
Show all steps
Your feedback will help us improve your experience
Josee Pacheco and 86 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
18. What chemicals are found in EMB agar that make it a selective medium? A) lactose and sucrose B) 7.5% sodium chloride C) methylene blue and eosin D) peptone and beef extract 19. When the diameter of a zone of inhibition caused by a disc impregnated with an antimicrobial agent is difficult to measure, one should __________________. A) measure the radius in millimeters from the center of the disc and use this value to get the diameter of the zone B) measure the radius in millimeters from the edge of the disc and use this value to get the diameter of the zone C) measure the radius in millimeters from the center of the disc and multiply this value by two to get the diameter of the zone D) measure the radius in millimeters from the edge of the disc and multiply this value by two to get the diameter of the zone 20. Mueller-Hinton agar is used in the standardized Kirby-Bauer test for testing antimicrobial agents because ______________________________________. A) it allows the antimicrobial agent to diffuse from the disk from an area of low concentration to an area of higher concentration B) it allows variance to be maximized between laboratories C) it allows antimicrobial agents to not diffuse freely D) None of the above choices are correct.
Suman K.
Sri K.
The Gram-negative bacterium Yersinia pestis, the causative agent of the plague, is extremely virulent. Upon infection, $Y$. pestis injects a set of effector proteins into macrophages that suppresses their phagocytic behavior and also interferes with their innate immune responses. One of the effector proteins, YopJ, acetylates serines and threonines on various MAP kinases, including the MAP kinase kinase kinase TAK1, which controls a key signaling step in the innate immune response pathway. To determine how YopJ interferes with TAK1, you transfect human cells with active YopJ (YopJ $^{\mathrm{WT}}$ ) or inactive YopJ (Yop] $^{\mathrm{CA}}$ ) and with FLAG-tagged active TAKI (TAK1WT) or inactive $TAKI (TAK1$ $^{K 63 W}$ ), and assay for total TAKI and for phosphorylated TAK1, using antibodies against the FLAG tag or against phosphorylated TAK1 (Figure $Q 23-1$ ). How does YopJ block the TAK1 signaling pathway? How do you suppose the serine/threonine acetylase activity of YopJ might interfere with TAK1 activation?
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD