Question

question 5 (1 point)
in the mr test, a yellow color after adding methyl red indicates a positive result.
true
false
question 6 (1 point)
in kia agar, gas production may be observed as cracks or bubbles in the medium.
true
false
question 7 (1 point)
biochemical tests are primarily designed to identify bacterial shape and arrangement under the microscope.
true
false

Explanation:

• Question 5: In the MR (Methyl Red) test, a red color indicates a positive result (indicating significant acid production from glucose fermentation), while a yellow color indicates a negative result.
• Question 6: In KIA (Kligler Iron Agar), gas production by bacteria can create cracks or bubbles in the agar medium as the gas exerts pressure and disrupts the solid structure of the agar.
• Question 7: Biochemical tests are mainly used to determine the metabolic capabilities of bacteria (such as fermentation of sugars, production of certain enzymes etc.), not to identify bacterial shape and arrangement. Microscopy (like Gram - stain microscopy) is used for observing bacterial shape and arrangement.

Answer:

• Question 5: B. False
• Question 6: A. True
• Question 7: B. False