Lebanese Baccalaureate - Life Sciences (LS) case studies
Lebanese Baccalaureate - Life Sciences (LS) · Put your knowledge to work in context.
The Lebanese Baccalaureate in Life Sciences (Bac LS, Sciences de la Vie) is the national school-leaving credential awarded to secondary students in Lebanon who follow the life-sciences track. It matters chiefly as a gateway: strong results support admission to university programs in medicine, pharmacy, biology, agronomy, and paramedical fields, in Lebanon and abroad. The examination is written and constructed-response in style - candidates write structured, multi-part answers rather than picking options. Expect to read experimental descriptions and data tables, draw conclusions, justify them, and perform short calculations. Topics on this exam: Cell Biology and Cellular Physiology, Genetics and Molecular Biology, Human Physiology and Homeostasis, Nervous System and Sensory Organs, Endocrine Regulation and Reproduction, Immunology and Defense Mechanisms, Ecology and Environmental Science, Evolution and Biodiversity, and Scientific Method, Experimental Analysis, and Data Interpretation. The Lebanese Baccalaureate - Life Sciences (LS) case studies are 5 cases and about 2,063 words.
1The Marathon Runner's Sodium Balance
A 42-year-old woman runs a 4-hour marathon on a cool day, drinking 4 L of plain water at aid stations. At the finish she is confused and nauseated.
428 words, about 2 min2Two Brothers, One Mutation, Different Fates
Two brothers inherit the same autosomal dominant mutation in a DNA mismatch-repair gene (MLH1). The older brother, now 55, developed colon cancer at 44 and had it resected.
412 words, about 2 min3The Pond That Turned Green
A farm pond receives runoff from fields fertilized with nitrogen and phosphorus. Over three summers, dissolved phosphorus rose from 0.02 to 0.35 mg/L.
405 words, about 2 min4The Reflex That Would Not Settle
A 60-year-old man is struck on the right knee tendon by a physician's reflex hammer. His right leg extends briskly; the left leg also twitches slightly.
426 words, about 2 min5Insulin, Timing, and the Morning High
A 24-year-old with type 1 diabetes takes a long-acting basal insulin at bedtime and rapid-acting insulin with meals. Over two weeks he records: fasting glucose consistently 11-13 mmol/L (high), glucose at 3 a.m.
392 words, about 2 min