An organism that causes infection as a result of a dog or cat bite was tested for catalase, resulting in a positive reaction. What could be the possible source of the error?
a. The catalase reagent could be expired.
b. This organism is normally negative for catalase; therefore a mutation may have occurred.
c. A false-positive result occurred because of the catalase production of the red blood cells in the 5% sheep blood agar.
d. No error is present. This organism is cata-lase-positive.
D
The organism is P. multocida, which is normally catalase-positive.
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Which of the following statements about gametogenesis is correct (select all correct choices)?
A. In human males, spermatogenesis begins at puberty. B. In human females, primary oocytes form during puberty. C. In human females, the egg that is released during ovulation is a primary oocyte. D. In human females, a secondary oocyte arrests in metaphase II. E. In human males, spermatogenesis results in one full-sized sperm and three polar bodies.
In which region of the plant are you most likely to find cells dividing by mitosis?
A. The growth rings B. The sapwood C. The meristem region D. The heartwood
What is an important effect of coastal upwelling? a. It creates a stable water column
b. It provides nutrients for photosynthesis. c. It brings zooplankton to the surface. d. It distributes new sediment.
What is the first step in the Calvin cycle?
a. O2 attaches to CO2. b. O2 attaches to G3P. c. CO2 attaches to RuBP. d. CO2 attaches to Rubisco. e. CO2 attaches to phosphoglycerate.