Praxis Biology 5236 case studies
Praxis Biology 5236 · Put your knowledge to work in context.
Praxis Biology: Content Knowledge (5236) is a subject-matter assessment used by many states and teacher-preparation programs as one part of the licensure pathway for aspiring secondary biology teachers. It is typically taken by candidates who already hold or are completing a bachelor's degree with substantial coursework in biology and who intend to teach at the middle or high school level. The Praxis Biology 5236 case studies are 5 cases and about 4,141 words.
1Duckweed Fertilizer Trial: Confounded by the Windowsill
A high school research class tests whether a liquid fertilizer increases duckweed growth. Students set up 12 identical 250-mL cups, each with 200 mL of pond water and 10 duckweed fronds.
777 words, about 4 min2Two Inhibitors, One Substrate: Reading an Enzyme Kinetics Table
An undergraduate lab measures alkaline phosphatase activity with p-nitrophenyl phosphate (pNPP) and follows product formation at 405 nm. Initial rates (micromoles of product per minute) were measured in triplicate at seven substrate concentrations with no inhibitor, with 10 micromolar inhibitor A, and with 10 micromolar inhibitor B.
805 words, about 4 min3Newborn Screening, Carrier Panels, and an Affected Child of Two Negative Parents
A provincial lab screens 250,000 newborns for an autosomal recessive metabolic disorder and confirms 4 affected infants. A carrier panel covering the five most common pathogenic variants, with an estimated detection rate of 90% for this disorder, was run on 1,000 randomly chosen adults from the same province; 12 were carriers.
820 words, about 4 min4Stocking Bass in Two Lakes: A Cascade That Worked Once
A lake district stocks largemouth bass into two small seepage lakes that had no piscivorous fish and had been turbid for a decade, to test whether top predators control algal blooms. North Lake is 8 ha; South Lake is 12 ha.
843 words, about 4 min5Five Years of Bt Corn Without a Refuge
A farmer plants continuous Bt corn on 400 hectares, using a single hybrid expressing one Cry protein active against European corn borer. Roughly 95% of the surrounding block also grows Bt corn, and the farmer has planted no non-Bt refuge for five years.
896 words, about 4 min