Which of the following methods has the least ability to sterilize below the surface? In other words, which has the least power to penetrate and sterilize? O a) electron beams b) all of these methods have very little penetrating power

This number is always less than one a) Dilution factor b) Dilution c) Both dilution factor and dilution d) Neither dilution nor dilution factor

How can moist heat sterilization can sterilize antibiotic solution?

Control of Microbial Growth A) Which would be the best process to use and why?  B) Can you use pasteurization? Explain. C)What is the true definition of an "antibiotic?"

You mixed up the numbers on the tubes when you inoculated the mannitol salt agar (MSA) plate. You do not know if you grew staph epidermis or E. coli. You found that the organism growing on the mannitol salt agar remained red after incubation. It is most likely that the organism is E.coli.  a) True b) False

).  Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n): A) Selective medium. B) Differential medium. C) Enrichment culture. D) Selective and differential medium. E) Differential and enrichment culture.

Discuss the principle of flame sterilization.

What is the major difference between an enrichment culture and a selective culture? Why are microbial doubling times in nature typically longer than those obtained in the lab? Briefly describe the following mechanisms of measuring bacterial growth: Direct microscopic cell count Plate count Most probable number

What is the most difficult type of microbial cell or structure to kill? What methods can be used to sterilize a sample contaminated with these?

Which of the following is used in the sterilization of the medium?a) benmargeb) swabc) autoclaved) centrifugee) cooling