Microbiology Answers

Explain why gram-negative bacteria are more resistant to biocides than gram-positive bacteria. Be specific and descriptive in your response. A description of the differences between gram-negative and gram-positive bacteria should be included, along with an explanation of why any of those differences would have anything to do with the actions of biocides.

The antibiotic amphotericin B causes leaks in cells by combining with sterols in the plasma membrane. Would you expect to use amphotericin B against a bacterial infection? A fungal infection? Offer a reason why amphotericin B has severe side effects in humans.

E. coli, Enterobacter aerogenes, Salmonella typhi, and Proteus vulgaris are all able to metabolize glucose. Why are they all not able to metabolize lactose and sucrose?

Negative acid from glucose tests indicate sugar was not metabolized to produce acids. How can growth be accomplished in a carbohydrate test medium when the sugar is not metabolized?

Sugar fermentation tests are positive when the pH turns acidic. How are media for these tests modified to allow production of acids to be detected?

What are the metabolic end products of Salmonella typhi and Proteus vulgaris when glucose has been metabolized?

what are synthetic nucleic acids useful for?
a-dna probes
b-primers for PCR
c-antisense RNAs
d-as DNA probes and antisense RNAs
e-as DNA probes, primers, and antisense RNAs

What is the role of the salt ingredient in making yeast bread?

What is the biochemical process the yogurt-making microorganism uses to get energy?