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Question 31 Coliforms have which of the following characteristics O Gram-negative, facultative aerobes, endospore-forming rods, ferment sucrose to produce gas Gram-negative, facultative anaerobes, non-endospore-forming cocci, ferment lactose to produce gas Gram-negative, facultative anaerobes, non-endospore-forming rods, ferment lactose to produce gas Gram positive, anaerobes, non-endospore-forming rods, ferment sucrose to produce gas O Gram-positive, facultative anaerobes, non-endosporing-forming cocci, ferment lactose to produce gas Question 32 What does it mean if a microscope is completely parfocal? 2.5 pts The micrscope has 3 objective lenses The lenses in the microscope are concave The lenses in the microscope are convex The image remains in focus when switching objective lenses O The microscope has higher magnification than most microscopes 2.5 pts

Question 33 What are the two types of light rays important for phase-contrast microscopy? Incident rays and reflected rays Refracted rays and diffracted rays Reflected rays and reflected rays Direct rays and reflected rays O Direct rays and diffracted rays- 2.5 pts