Catalonia PAU Biology case studies
Catalonia PAU Biology · Put your knowledge to work in context.
This independent study page provides practice for Catalonia PAU Biology. Its editorial learning areas include Biochemistry; Cell structure, membranes and division; Genetics, inheritance and molecular information; Metabolism; Biological inquiry and interpretation of evidence; Microbiology Immunology; Biotechnology. The questions develop subject knowledge and application through worked reasoning, distinctions between competing answers, and practical scenarios. Study the relevant guide before attempting a mixed set, then explain the evidence or calculation that supports each answer. Topics on this exam: Biochemistry, Cell structure, membranes and division, Genetics, inheritance and molecular information, Metabolism, Biological inquiry and interpretation of evidence, Microbiology Immunology, and Biotechnology. The Catalonia PAU Biology case studies are 4 cases and about 1,065 words.
1Potato-cell mass change and a controlled concentration comparison
A class analyzes a supplied dataset from equal-sized potato cylinders placed in several labeled solutions. The cylinders began with the same average mass, and the observation interval, temperature and blotting convention were matched. The solution labels are concentrations in a hypothetical exercise, not a preparation recipe. Mean mass changes were plus 6 percent in solution A, plus 2 percent in B, approximately zero in C and minus 5 percent in D.
262 words, about 1 min2A pea-plant cross and the meaning of an expected ratio
A hypothetical pea trait is controlled by a single autosomal locus with alleles P and p. Complete dominance is explicitly assumed: PP and Pp plants have purple flowers, while pp plants have white flowers. There is no differential survival among genotypes, mating and fertilization follow the supplied Mendelian model, and offspring outcomes are independent for this exercise. Two heterozygous plants are crossed and produce 100 scored offspring: 78 purple and 22 white.
264 words, about 1 min3Enzyme-rate models without assuming a binding location
A class receives fitted rate models for a harmless hypothetical enzyme system; no experiment or chemical treatment is being prescribed. Both curves follow the simple Michaelis-Menten form v = Vmax times S divided by Km plus S over the stated measurement range. Without inhibitor, Vmax is 60 rate units and Km is 2 concentration units. With inhibitor, the fitted Vmax remains 60 while the fitted apparent Km rises to 8.
262 words, about 1 min4Light and dark oxygen data in an algal model
A class analyzes simulated oxygen measurements from matched algal culture bottles. The dataset is supplied for reasoning and is not a culture protocol. Independent illuminated bottles show net oxygen changes of plus 11, plus 12 and plus 13 concentration units per hour. Matched dark bottles show changes of minus 4, minus 5 and minus 6 units per hour.
277 words, about 1 min