17- To cultivate fungi, a selective medium such as bacterial growth. is ideal du

Question

17- To cultivate fungi, a selective medium such as bacterial growth. is ideal due to its low pli that inhibits a. Sabouraud agar b. Nutrient agar c. Mueller Hinton 11 d. None of the above 38- Molds have microscopic intertwining filaments callecd a Hyphae b. Septac c. Basidiomycetes d. Ascomycetes 39- Many media in microbiology are called defined media because A. the exact composition 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 exacrty 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 wil i growing, Such a medium is a A. selective medium B. defined medium C. a differential medium D, a solid agar 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. phospbolipids D. none of the above 43-Endospores are commonly produced by bacteria in the genus A. Bacillus B. Clostridium D, Both (A) and (B) 44- Which of the following sentences is/are true about endospores? A. Endospores allow bacteria to survive environmental conditions that are not favorable for groth 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, microaerophiles C, aerotolerant organisms D. obligate anaerobes 46-Streptococei belong to the group of A. facultative anaerobes B. microaerophiles C. acrotolerant organisms D, obligate anaerobes

Explanation / Answer

1.
To cultivate fungi, a selective medium such as sabouraud agar is ideal due to its low pH which inhibits
bacterial growth.
Saboraud agar is a selective medium primarily supports growth of fungi because of very low pH(5).
Option a is the answer.

2.
Fungi contain microscopic filaments which are interwined called as hyphae.
These highly branched hyphae resemble roots of a plant.
Option a is the correct answer

3.
Defined media is a growth media in microbiology in which all the chemical constituents are known.
Defined media is usually used to culture animal or human cells.
Option b is the answer

4.
Media which have certain components and allow only certain specific bacteria to grow only
is known as selective media.
Option a is the answer

5.
Chemolithotrophs are the organisms which derive their energy by oxidizing inorganic molecules and obtain
energy.
Option a is the answer.

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