Answer all the following questions (50) using scantron cards. Time allowed: 1 Ho

Question

Answer all the following questions (50) using scantron cards. Time allowed: 1 Hour 1. A loop or needle is sterilized by inserting it to a Bunsen burner until it is red hot. This will a congulate any contaminating organisms that may be present b. incinerate any contaminating organisms that may be present c activate any contaminating organisms that may be present d. all of the choices are true 2. With a pare culture, one is able to study a the cultural characteristics of an individual organism b. the morphological characteristics of an individual organism c. the physiological characteristics of an individual organism d. all of the above 3. The use of a single stain to color a bacterial cell is commonly referred to as a special stain b. simple stain c. negative staind. pure stain 4. The phase contrast microscope is best suited for observing a. living organisms in an uncovered drop on a slide b. stained slides with cover glasses c. living organisms in hanging drop slide preparation d. living organisms on a slide with a cover glass 5. The coarse and fine adjustment knobs adjust the distance betweern a. the objective and the ocular lenses cthe ocular lenses b. the stage and the objective lens d. the stage and the condenser 6. The resolving power of a microscope is a function of a. the magnifying power of the lenses b. the numerical aperture of the lenses c. the wavelength of light d. both b and c are correct 7. Anionic chromophores are classified as a. acidic dyes b. basic dyes c.neutral dyes d. none of the above 8. Which of the followings is a Gram-negative rod? a. Pseudomonas aeruginosa c.Bacillus megaterium ococcus aureus

Explanation / Answer

1.A loop or needles is sterilized by inserting it into a Bunsen burner flame until it is red hot. This will incinerate any contaminating organisms that may be present.

2.with a pure culture one is able to study able to study cultural, morphological, and physiological characteristics of an organism.so all of the above

3.The use of a single stain to color a bacterial cell is commonly referred to as simple stain

4.The phase-contrast microscope is best suited for observing Living organisms on a slide with a cover glass

5.the coarse and fine adjustment knobs adjust the distance between the stage and the objective lens

6.the resolving power of a microscope is a function of-- both b and c are correct

7.anionic chromophores are classified as? basic dyes

8.Pseudomonas aeruginosa are gram negative rod

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