Answer the following statement(s) true (T) or false (F)
1. The gelatin test requires refrigeration before incubation in order to correctly evaluate the result.
2. An indirect ELISA will only be positive if the patient has an active infection.
3. In an ELISA, the enzyme is conjugated to antibodies from the patient's serum.
4. Mycobacterium smegmatis is expected to be colored blue at the end of a successfully complete Acid-Fast stain.
5. A negative stain begins with a heat fixed smear.
1. False
2. False
3. False
4. False
5. False
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Apples that we find in the grocery store today are much larger and sweeter than those found in the wild hundreds of years ago. Which process is responsible for this change?
A. Resistance to pesticides B. Artificial selection C. Genetic drift D. Survival of the fittest
Contrary to popular belief, stress is not usually the primary cause of ulcers, and many patients with ulcers do not over-produce acid. What Nobel prize-winning discovery demonstrated a previously unknown cause of ulcers?
A. the existence of a bacterial infection in the stomachs of most patients with ulcers B. genetically predetermined weakness in the walls of the intestinal tract C. the eroding effect of certain spicy foods on the lining of the esophagus D. greater acid concentrations in the stomach, lower esophagus, and duodenum
After the Decolorization step in Gram staining, Gram-positive bacteria will appear
A. Pink/red in color B. Green in color C. Brown in color D. Blue/Purple in color E. Colorless
The set of blood vessels with the slowest velocity of blood flow is
A) the arteries. B) the arterioles. C) the metarterioles. D) the capillaries. E) the veins.