37- To cultivate fungi, a selective medium such as bacterial growth. a. Sabourau
ID: 132662 • Letter: 3
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37- To cultivate fungi, a selective medium such as bacterial growth. a. Sabouraud agar b. Nutrient agar c. Mueller HintonI d. None of the above 38- Molds ha ve microscopic intertwining filaments called a. Hyphae b. Septac c. Basidiomycetes d. Ascomycetes 39- Many media in microbiology are called defined media because ition of the individual amino acids, vitamins, growth factors, and other components are not exactly known B. the exact composition of the individual amino acids, vitamins, growth factors, and other components are exactly known C. Both A and B are correct D. Both A and B are incorrect 40- Media can be made with components that will allow certain bacteria to grow but will inhibit others from growing. Such a medium is a C, a differential medium D. a solid agar medium A. selective medium B. defined medium 41-Chemolitotrophs organisms A. oxidize inorganic ions such as nitrate or iron to obtain energy B. contain photosynthetic pigments that convert solar energy into chemical energy C. derive their energy needs from organic molecules by fermentation or respiration D. derive their energy from photosynthesis but their carbon needs from growth on organic molecules 42- The exosporium found in endospores is composed of A. peptidoglycan B. protein C. phospholipids D. none of the above 43-Endospores are commonly produced by bacteria in the genus A. Bacillus C. Mycobacterium D. Both (A) and (B) B. Clostridium 44- Which of the following sentences is/are true about endospores? A. Endospores allow bacteria to survive environmental conditions that are not favorable for growth B. Their resistance is due in part to the fact they have a thick endospore coat C. They are resistant to heat, radiations, acids, and disinfectants D. Endospores represent a dormant stage E. All of the above sentences are true 45- Some bacteria derive energy by oxidative respiration if oxygen is present but are capable of using fermentation in the absence of oxygen. These bacteria are A. facultative anaerobes B. microacrophiles C. aerotolerant organisms D. obligate anaerobes 46-Streptococci belong to the group of A. facultative anaerobes C. acrotolerant organisms D. obligate anaerobesExplanation / Answer
37. The medium used to cultivate fungi is of acidic pH. Such media is used to inhibit the growth of bacteria. Due to its special pH and composition, the media is said to be selective.
The media used is Sabouraud agar. So, the answer is option (a).
38. The microscopic interwining filaments found in molds is called hyphae. It is the structure found in microscopic examination of many fungus. So, the answer is option (a).
39. In case of defined media, the exact composition of nutrients, that is, individual amino acids, vitamins, growth factors and other components is known. So, the answer is option (B).
40. A media which allows certain bacteria to grow while ptreventing others is said to be a selective media. Along with other components, pH of such a media is maintained to prevent growth of undesirable microorganisms. Besides it, sometimes antibiotic or other special components are added to prevent growth of other microorganisms. So, the answer is option A.
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