12. Which of the following media is selective for molds? nutrient agar b. EMB me

Question

12. Which of the following media is selective for molds? nutrient agar b. EMB medium c.Sabouraud's agar d. none of the above True or False (True -A; False B)(13-18) 13. The capsule of Streptococcus pneumoniae prevents phagocytic white blood cells from engulfing and destroying this bacterial pathogen 14. In Gram staining procedure, the primary stain is methylene blue 15. The resistance of endospore to heat, radiation, acids and many chemical is due in part to the fact that they have a thick protein coat of mycolic acid 16. Non-acid fast bacteria such as Bacillus subtilis are stained blue 17. Rhizobium and Azobacter are examples of nitrogen-fixing bacteria 18. Photoheterotrophs bacteria derive their energy from photosynthesis but their carbon come from growth on organic molecules such as glutamate Multiple choices (19-25) 19. Medium can be made with components that will allow certain bacteria to grow but will inhibit others rom growing. Such a medium is called a aselective medium b. a suppressive medium c. a differential medium d. a solid agar medium 20. The exosporium or endospore coat is composed of none of the above c. phospholipids 21. Endospores are produced by bacteria in the ssnus a, Staphylococcus b, Clostridium 22. Some bacteria can grow by respiratory means if oxygen is present but if oxygen is absent, they can also grow using fermentation. These bacteria are said to be a. obligate acrobes b. acrotolerant microorganisms e.none of the above c. obligate anacrobes d. microaerophiles 23. Clostridium species belong to the group of a. obligate aerobes b. aerotolerant microorganisms e. none of the above c. obligate anacrobes d. microaerophiles 24. Which of the following enzymes are likely to be found in anacrobic bacteria? a. catalase b. superoxide dismutase c. peroxidase d. none of the above 25, which of the following is false about tryptone glucose yeast extracts medium (????? a. is used to prepare "shake tubes" c. it is used to determine the oxygen requirements of different bacteria d. it is a solid medium b. is used primarily for the cultivation of anaerobes 26. In the Kirby-Bauer test the significance of a zone of inhibition varies with the type of microorganism 27. Some disinfectants are classified as sterilants or sporocides because they destroy all microbial life True or False (True A: False B) (26-33) except endospores True

Explanation / Answer

Ans 12 : c) Sabouraud's agar

The selective agar for molds is YM agar or Yeast and mold agar or 'Yeast extract Malt extract' agar . This agar in 1910 was introduced by Sabouraud.

The agar has low pH that helps in cultivation and isolation of yeasta and molds.

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