47-Which of the following enzymes are found in aerobic bacteria? A. catalase B.

Question

47-Which of the following enzymes are found in aerobic bacteria? A. catalase B. superoxide dismutase C. peroxidase D. all of the above 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 50- E. coli is a gram positive coccus B. gram negative coccus C. gram positive rod D. gram negative rod

Explanation / Answer

47-

Aerobic bacteria produces oxygen radical such as peroxide, superoxide radical which if not converted into H2O can be catastrophic for the cell. The enzyme such as catalase, peroxidase and superoxide dismutase convert oxygen radical into H2O.

So answer is all of the above which option D.

48- when we transfer the bacteria from one tube to another it is advisable to flame the mouth of the tube so that we can reduce the contamination.

Heating the mouth of the tube incarnate the bacteria

So the answer is option A.

49 - Basic dyes are the dye which binds to the acidic part of the bacterial membrane.

Methylene blue is the basic dye and the other two are the acidic dye.

SO answer is option C.

50 - E. coli is a gram negative bacteria as it gives purple colour in the gram-negative stain.

When we look at the morphology of the E. coli we see the rod shape in the microscope.

SO answer is Gram-negative rod which is option D.

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