You are working up a throat culture and notice beta hemolytic colonies. The isolate is catalase negative, so you set up a bacitracin susceptibility (A Disk). The results are pictured below. What is the most likely identification of this organism?

You have isolated a gram-positive cocci in tetrads from a skin swab. The colonies are a mustard yellow color. It is catalase positive, coagulase negative, and oxidase positive. Which of the following is the identity of the organism?

You are working up a patient’s wound culture. You have pure, 4+ growth of this beta hemolytic yellow organism. You do a quick gram stain, and it shows gram-positive cocci in clusters. What would your next steps be in working up this culture? Be sure to mention any biochemicals/tests that would be RELEVANT in furthering this identification.

Which of the following characteristics of a protein will remain intact if the protein is denatured?

You are working up this grey colored organism with gamma hemolysis and you have the following test results, see picture below. Your catalase test is negative. What is the most likely identification of this organism.

Which statement best describes the relationship between a tissue and an organ system?

All streptococcus species are catalase positive.

The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?

A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-Ω resistor. What is the rms value of the voltage across the resistor?

A bar magnet is oriented above a copper ring, as shown in the figure. The magnet is dropped and passes completely through the ring. As viewed from above, what is the direction of the current induced in the ring after the magnet has completely passed through the ring and is somewhat below it?