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Suppose you are performing an Ouchterlony double diffusion assay loading Ag1 and Ag3 in 2 wells close to the edge and Ab1 and Ab3 in the middle well. Suppose antigen 3 has an epitope in common with antigen 1. One of the antibodies reacts with the epitope common to both antigens. The other antibody reacts with a different epitope on antigen 1 (that is absent on antigen 3). Two precipitin lines form, with a spur pointing toward antigen 3. What does this result indicate?

A new assay is used to test 120 samples from patients with a clinically confirmed diagnosis of the relevant infection and 50 samples from healthy control subjects. The test results were positive for 90 of the infected patients and positive for 10 of the healthy controls. Calculate the positive predictive value of the assay.  

When both antigen and antibody diffuse independently into a gel, the process is called:

Which of the following is an accurate list of the 6S Lean system tool?

Consider the problem below. Please select the answer choice that best represents the rationale on how to arrive at the answer.   A committee of three people will be selected from 12 to plan graduation party.  How many different committees are possible?

An ice cream store sells 5 drinks, in 4 sizes, and 3 flavors. In how many ways can a customer order a drink?

Sports Bar and Tasty Tacos are adjacent businesses with adjoining parking lots. Sports Bar offers Tasty a discount on purchases if the restaurant will not tow the cars of Sports Bar’s patrons who park in the restaurant’s lot. The discount is legally sufficient consideration

A fire threatens to engulf a commercial building in Middletown. The building’s owner promises a cash reward to the Middletown Fire Department to extinguish the blaze. The firefighters cannot claim the reward because

Kara enters into a contract to buy a thoroughbred from Rancho Mesa. Kara can disaffirm the contract

Ocean Inc., a seafood distributor, agrees to buy from Paul, a commercial fisher, any “overstock” of fish that he catches in excess of the legal limit. This agreement is most likely