The antibiotic typically used to treat MRSA is:

You have the option of selecting either option A or B for each question. If you respond to both options, only the first response will be graded. Please indicate which question you intend to respond to.  1A. Explain how Fredrick Griffith proved that genetic material can be directly transferred between bacterial cells.  1B. Describe the steps of the gram staining procedure. Make sure to discuss how the reagents affect gram-positive and gram-negative bacteria differently.

A 62-year-old patient presented to his primary care doctor complaining of a bloody cough. The organism was purple-pink when an acid-fast stain was performed and the colony morphology is pictured. Select the biochemical test results that should be expected for the organism. (Select all that apply).  

Which organism commonly causes food poisoning by consumption of food containing preformed, heat-stable enterotoxin?

Which of the following classes of antibiotics interferes with ribosomes?

Based on colony morphology, antibiotic resistance and hemolytic pattern, the circled organism pictured is likely:  

A 27-year-old woman in her 30th week of pregnancy presented to the ER because of premature labor. She reported that she hadn’t felt well over the past few days and that it started a couple days after eating a salad with raspberries, walnuts, cranberries and goat cheese.   Cultures from the amniotic fluid and placenta revealed smooth round colonies with a narrow zone of beta-hemolysis on the BAP. Which test should be performed to identify the organism based on the patient presentation and morphology? 

1. An important cause of acute exudative pharyngitis is: 

It’s your first day working in the microbiology lab as a research assistant. You are instructed to use moist heat to sterilize media that will be used to culture bacteria. In order to eliminate all organisms and endospores, which autoclave settings should you use?

Two packages are connected by a very light string that goes over an ideal pulley as shown in the figure. Package A has a mass of 3.0 kg and can slide along a rough plane inclined at 30° above the horizontal. The string acts on package A parallel to the surface of the plane. The coefficient of static friction between package A and the plane is 0.40. What minimum mass should package B have in order to start package A sliding up the ramp? (Write your answer only in numbers – no units)