ILTS Science: Biology (239) case studies
ILTS Science: Biology (239) · Put your knowledge to work in context.
Science: Biology (239) is one of the content-area tests listed in the Illinois Licensure Testing System (ILTS) catalog, published on the ILTS site at il.nesinc.com. It sits alongside Science: Chemistry (240), Science: Earth and Space Science (241), Science: Environmental Science (242), and Science: Physics (243) as a single-subject science assessment, and it is intended for candidates seeking an Illinois educator license with a biology endorsement. The ILTS program is administered for the Illinois State Board of Education, but this page is independent study material and is not affiliated with ILTS, Pearson, or the State of Illinois. The public catalog does not publish a subdomain breakdown, item count, or time limit for this title, so build your preparation around the biology content that a secondary biology teacher is expected to teach: molecules and cells, genetics and evolution, organisms and populations, and the nature and practice of scientific inquiry, including data analysis and experimental design. The ILTS Science: Biology (239) case studies are 5 cases and about 3,005 words.
1Disk Diffusion and the Language of Resistance
In a 10th-grade biology lab, students run a disk-diffusion assay with nonpathogenic E. coli K-12 on Mueller-Hinton agar.
658 words, about 3 min2A Negative Carrier Test in an X-Linked Disorder
After a genetics unit, a 16-year-old female student asks a teacher candidate a personal question. Her mother's two brothers have Duchenne muscular dystrophy (DMD), an X-linked recessive disorder.
552 words, about 3 min3Mark-Recapture After Rain
On an ecology field trip to a restored tallgrass prairie, students estimate a flightless ground beetle population by mark-recapture. On Monday they capture 80 beetles in a 20 m by 20 m plot, mark each with fluorescent powder, and release them.
614 words, about 3 min4Catalase, Foam Height, and Overreach
Students investigate catalase by measuring foam height 30 seconds after adding 3% hydrogen peroxide to blended potato or liver. Each group uses 5 g of tissue and 10 mL of peroxide at room temperature.
558 words, about 3 min5Which Mitotic Index Should the Class Trust?
Students prepare onion root tips, stain with acetocarmine, and count cells in one field of view to estimate the mitotic index. One pair reports 18 prophase, 4 metaphase, 2 anaphase, 1 telophase, and 75 interphase cells, for 25/100 = 25%.
623 words, about 3 min