QUESTION Which of the following control methods would be best used to sterlize a

Question

QUESTION Which of the following control methods would be best used to sterlize a heat-Jabile (heat-sensitive) liquid? a 02 micron (um) membrane filtration Ob autoclaving O c.dry heat oven o d pasteurization QUESTION 2 Which one of the following types of microorganisms produce colonies o a bacteña O b viruses o c algae that typially are thick tuzzry or furry, and relatively large molds 5points Sav QUESTION 3 O b immersion spoints QUESTION 4 represents the ablity b seperte two cosely spacedponts O a Numerical aperture Ob Light wavelength

Explanation / Answer

Question: 1: a) 0.2 micron membrane filtration

The heat-sensitive compounds like vitamins, antibiotics in the nutrient media preparation will be filter sterilised using membrane filters. the pore size will be lesser then microbes so the filter will be free from microbes.

Question 2: d)Molds

Molds show distinct features in laboratory culture on Petri dish they posses fuzzy, cottony, powdery, spreading and thread-like colonies than other organisms.

Question 3: d) Parfocal

A parfocal lens is the type of lens which will not change their focus to the object, even after changing the focal length. using them on microscope may allow us to focus then zoom in to enlarge the image and later we can also zoom out the image without changing focus, unlike varifocal lens which used in still photography.

Question 4: c) resolving power

The resolving power makes an optical instrument to separate the closely located points and identify them as individual entities. For camera or microscope, this resolving power is the main factor for the quality of the image.

If the optical instrument has high resolving power then it can identify closely located points, but if the optical instrument has less resolving power then it cannot distinguish the two different closely located points in the image as separate entities.

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