CD4 and CD8 proteins are used for in vitro tests as T cell markers to differentiate TH cells from TC cells
Indicate whether the statement is true or false.
Answer: TRUE
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Lupins are an angiosperm genus having "cluster roots," which are roots that have high metabolic rates and exude large quantities of organic acids to the soil. What purpose might exuding organic acids serve?
A. It provides energy for free-living soil microbes. B. It provides energy for symbiotic microbes. C. It raises soil pH to liberate tightly bound minerals. D. It lowers soil pH to liberate tightly bound minerals.
The concentration protocol of the ova and parasite (O&P) examination:
a. requires freshly passed, unpreserved stool. b. is designed to allow the detection of pro-tozoan cysts, coccidian oocysts, micro-sporidial spores, and helminth eggs and larvae. c. is microscopically examined at low, high dry, and oil immersion magnifications. d. is designed to facilitate the identification of intestinal protozoa.
Populations
a. are only limited by one factor at a time. b. increase arithmetically. c. may increase indefinitely. d. are limited by the carrying capacity. e. overcome limiting factors by increasing their biotic potential.
You are working in a biotech company that has discovered a small-molecule drug called H5434. H5434 binds to LDL receptors when they are bound to cholesterol. H5434 binding does not alter the conformation of the LDL receptor's intracellular domain
Interestingly, in vitro experiments demonstrate that addition of H5434 increases the affinity of LDL for cholesterol and prevents cholesterol from dissociating from the LDL receptor even in acidic conditions. Which of the following is a reasonable prediction of what may happen when you add H5434 to cells? (a) Cytosolic cholesterol levels will remain unchanged relative to normal cells. (b) Cytosolic cholesterol levels will decrease relative to normal cells. (c) The LDL receptor will remain on the plasma membrane. (d) The uncoating of vesicles will not occur.