TASC Biology Level 3 case studies
TASC Biology Level 3 · Put your knowledge to work in context.
TASC Biology Level 3 is an independent study resource for learners who want a structured, mid-level review of biology before sitting a high school equivalency or placement-style science assessment. It suits candidates who already know basic cell vocabulary and want to connect molecules, heredity, evolution, organisms, and ecosystems into one coherent picture, and it works equally well for adult learners returning to study after a break. The material is organized around six domains: molecules and cells, genetics and heredity, evolution and diversity, organisms and populations, ecology and environment, and scientific inquiry and skills. Each domain blends recall with application, so you practice interpreting data, reading diagrams described in text, and choosing the best explanation rather than simply naming terms. The TASC Biology Level 3 case studies are 5 cases and about 2,054 words.
1The Dialysis Bag Diffusion Experiment
A student fills a dialysis bag (a semipermeable membrane with pores that allow water, glucose, and iodine to pass but block starch) with a mixture of 2% starch and 1% glucose solution, then seals it and places it in a beaker of distilled water containing iodine. After 30 minutes, the water outside the bag turns blue-black.
453 words, about 2 min2Two Families and a Recessive Disorder
A couple, both unaffected, have a child with an autosomal recessive disorder. Genetic testing shows both parents are heterozygous carriers.
444 words, about 2 min3Antibiotic Resistance in a Hospital Outbreak
A hospital reports an outbreak of a bacterial infection. Culture shows a strain that is resistant to the first-line antibiotic but sensitive to a second-line drug.
381 words, about 2 min4Deer and Wolves on an Isolated Island
On an isolated island, a deer population feeds on shrubs. Wolves were introduced to control the deer.
395 words, about 2 min5Testing a Fertilizer Claim
A student reads that a new liquid fertilizer increases tomato plant height. She designs an experiment: 10 plants get fertilizer, 10 get plain water, all in the same greenhouse.
381 words, about 2 min