Question

24. Immersion oil is used between the specimen and the oil immersion objective A) to cut down the intensity of light B) to keep light rays from scattering C) to allow the slide to move easier on the stage D) to improve the color on the slide E) none of the above = identify 25 In the Gram stain, the iodine serves as the A) primary stain B) fixative C) decolorized D) mordant E) counterstain 26. Cross reference of all lecture and laboratory information is a requirement for successful understanding of this course. This statement can be found in the syllabus on paragraph none of the above identify E) A) 17-96 page D) 7-30 B) page 11 -51 C) 19-107 27. Which of the following is mismatched? A) thermopiles: microorganisms growing better at high temperatures B) facultative halophiles: -microorganisms able to tolerate high concentrations of salt C) obligate aerobes: microorganisms requiring oxygen for growth D) obligate anaerobes: microorganism that grow well in the presence of oxygen C) psychrophiles: microorganisms that grow better a low temperature E) none of the identify above

Answer 1

24.) B---- to keep light Rays from scattering .

Immersion oil reduces light diffraction.

25.) D---- mordant

26.) As we have not seen the syllabus. We can't predict the answer of this question. I am very sorry. Hope you understand.

27.) D---- obligate anaerobe: microorganisms that grow well in the presence of oxygen.

Obligate anaerobe are poisoned by oxygen.