Sheep Blood agar is "stabbed" when inoculating bacteria to enhance hemolysis caused by:
a. streptolysin O.
b. streptolysin S.
c. streptokinase.
d. hyaluronidase.
A
SBA should be stabbed to force some of the organism to grow in a reduced oxygen content which allows for the detection of streptolysin O, an oxygen labile virulent factors produced by S. pyogenes
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Sensory nerves communicate the strength of a stimulus by
a. the magnitude of the voltage change across the membrane during the action potential. b. the speed at which the action potentials are transmitted down the axon. c. the number of action potentials transmitted down the axon. d. a and b. e. a and c.
Which is incorrect about measles?
A) Koplik's spots appear before the characteristic rash. B) It is one of the most contagious infectious diseases. C) It is also known as rubeola. D) Humans are the sole reservoir. E) Vaccination is with an attenuated oral vaccine.
Instead of coping with stress, some animals ________ by leaving the population to seek vacant habitats
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. A magnifying glass could be considered a simple microscope. 2. The total magnification achieved when the oil immersion lens is used is 1,000 ×. 3. Fluorescence microscopy is often used in immunology laboratories. 4. The resolving power of electron microscopes is much better than that of compound light microscopes because the wavelength of electrons is much longer than that of visible light. 5. Primary syphilis is usually diagnosed in the clinical microbiology laboratory by the use of a scanning electron microscope.