MTLE Life Science (Grades 9-12) case studies
MTLE Life Science (Grades 9-12) · Put your knowledge to work in context.
Life Science (Grades 9–12) is one of the content-area tests listed in the Minnesota Teacher Licensure Examinations (MTLE) program, the testing system used for Minnesota educator licensure. Candidates typically take it to demonstrate subject-matter knowledge for a secondary life science license, and the MTLE site advises that testing requirements depend on licensure type, so confirm your own requirement list before registering. The MTLE Life Science (Grades 9-12) case studies are 5 cases and about 2,449 words.
1Potato Osmosis Lab With a Reversed Data Point
During a 50-minute block, 28 students in six lab groups measure osmosis in potato cores. Each group cuts six cores from the same potato, weighs them to 0.01 g, soaks one core in 0.0, 0.2, 0.4, 0.6, 0.8, or 1.0 M sucrose for 20 minutes, blots, and reweighs.
498 words, about 2 min2PTC Survey and a Premature Hardy–Weinberg Claim
In a 120-student ninth-grade survey, 78 students report tasting PTC paper and 42 report no taste. A student calculates q² = 42/120 = 0.35, q = 0.59, p = 0.41, then writes that the class is not in Hardy–Weinberg equilibrium because p is not 0.50 and that selection must be favoring the nontasting allele.
613 words, about 3 min3Aquarium Oxygen Drop and Bicarbonate Confound
Two 20 L aquaria are prepared with aged tap water and 12 Elodea shoots each. Tank A receives 0.5 g/L sodium bicarbonate; Tank B receives none.
460 words, about 2 min4Pillbug Choice Chamber With Confounded Cues
Students place 10 pillbugs in a choice chamber with four quadrants: moist-light, moist-dark, dry-light, dry-dark. After 10 minutes they count 7 in moist-dark, 2 in dry-dark, 1 in moist-light, 0 in dry-light.
432 words, about 2 min5Scalpel Injury During a Preserved-Specimen Dissection
During a 45-minute chicken wing dissection, 24 students use scalpels and probes. A student wearing latex gloves punctures the left index finger with a scalpel; the cut bleeds through the glove.
446 words, about 2 min