43-Endospores are commonly produced by bacteria in the genus A. Bacillus Mycobac

Question

43-Endospores are commonly produced by bacteria in the genus A. Bacillus Mycobacterium D. Both (A) and (B) B. Clostridium C. 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 organisms B. microaerophiles D. obligate anaerobes 46-Streptococci belong to the group of A. facultative anacrobes organisms B. microaerophiles 47-Which of the following enzymes are found in aerobic bacteria? A. catalase B. peroxidase D. all of the above C. aerotolerant D. obligate anaerobes superoxide dismutase C 48- When transferring bacteria from one tube to another, it is important to flame the mouth of the tube because a) it helps avoid contamination b) one gets to play with the Bunsen burner c) it helps seal the test tube correctly d) none of the above 49- A basic dye used to stain E. coli is a) eosin b) India ink c) methylene blue d) none of the above

Explanation / Answer

43. Endospores are produced by the

D. Both A and B

Endospores are mainly formed by the bacillus and clostridium bacteria.

44. Sentences true about endospores

E. All are true.

Endospores allow bacteria to sirvive environmental conditions

They have a thick endospore coat.

They are resistant to heat,radiation,acid and disinfectants.

They are dormant stage.

45. Some bacteria derive energy by aerobic respiration if oxygen is present but they can switch to fermentation in anaerobic conditions ,these are called

A. Facultative anaerobes.

46. Streptococci belongs to

A. Facultative anaerobes group

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