This staff-only planning overview contains complete first/later source material together. For actual learner handout, choose the separate clean source for the needed case: E1 first, E2 first, F1 first or F2 first. Collect the first response before supplying the matching E1 later, E2 later, F1 later or F2 later source. Do not hand out this combined overview before collection. Keep rechecks for a delayed new encounter after targeted feedback. Do not use them as taught examples first. Select a recheck for the particular skill; they are not secure exams or equivalent whole-unit instruments. Capture response and support before discussing the separate key.
E1 · A second boundary file
Complete source: Neutral N is 9 mmol/L inside and 3 mmol/L outside, cannot cross the bare bilayer and has a suitable passive carrier. Neutral P is 2 mmol/L inside and 5 mmol/L outside; an ATP-coupled pump carries P outward. A separate pouch has 0.12 mol/L impermeant neutral solute inside and 0.28 mol/L outside. Water crosses; solute does not; temperature and initial hydrostatic pressure are equal. A word map describes water on both sides of a phospholipid bilayer, a channel, an external carbohydrate chain on a glycoprotein and cholesterol among tails in an animal model. Values and map are original conceptual material.
Complete task: For N and P give mechanism, net direction, concentration evidence and energy statement; explain net movement. Describe head/tail orientation, one role each for channel, glycoprotein and cholesterol, and a model limit. Predict initial net water movement for the pouch, naming all stated conditions, the moving substance and one unavailable outcome. Then consider the same pouch with unknown pressure difference: qualify the water prediction and request the needed information.
E2 · An equal-concentration pouch
Complete source: Neutral J is 4 mmol/L outside and 1 mmol/L inside and can cross the bilayer. Neutral K is 2 mmol/L outside and 6 mmol/L inside; a specified ATP-coupled pump carries K inward. A separate pouch has 0.22 mol/L impermeant neutral solute both inside and outside; water can cross, solute cannot, and initial temperature/pressure are equal. Use the complete membrane word map: water on each side, phospholipid bilayer, selective channel, external carbohydrate on glycoprotein, cholesterol among tails in a typical animal model. Values and map are supplied teaching models.
Complete task: Explain J and K's mechanisms/directions/energy with evidence and the meaning of net movement. Explain head/tail orientation and the three listed component roles with a limit. Explain the pouch's initial net water result and continuing molecular motion under the supplied conditions; name an unavailable outcome. In a new pressure-unknown scenario with the same equal solute values, state whether no net water movement can still be asserted with certainty and what information is needed.
F1 · Two larger paper cubes
Complete source: Cube C has edge 4 mm; D has edge 8 mm. Area = 6a²; volume = a³; distance = a/2. Each has a supplied layer 1 mm deep at 5 min. Central edge = max(a − 2d, 0); fraction penetrated = 1 − (central edge/a)³; For this supplied interval, the layer starts at depth d_start = 0 mm when t_start = 0 min. Average front speed = Δdepth/Δtime = (d_end − d_start)/(t_end − t_start). This is the model's interval average, not a constant future speed, intrinsic diffusion coefficient or molecular flux. In a separate supplied endpoint file C has 70, 74, 78 s and D 130, 134, 138 s. Material, solution and endpoint rule match; temperature/stirring are initially unknown. Later plan notes say C was 18°C and D 28°C, with unstandardised stirring. All data are original conceptual examples; no experiment was performed.
Complete task: Calculate both areas, volumes, ratios with units and centre distances. Calculate both fractions and average front speed, explaining why fraction is not intrinsic speed. Calculate means/ranges in the separate endpoint file and give a bounded comparison, missing condition and improvement. After a first response is captured, release the later temperature/stirring notes from the source above and request a second response: keep or revise the claim with reasons; name the unchanged geometry, confounds, defined dependent measure and independent-repeat improvement. Staff must supply the initial source with the sentence beginning “Later plan notes” withheld until first capture.
F2 · Full penetration is a boundary case
Complete source: Cube G has edge 2 mm; H has edge 4 mm. Area = 6a²; volume = a³; distance = a/2. Each has a supplied layer 1 mm deep at 4 min. Central edge = max(a − 2d, 0); fraction penetrated = 1 − (central edge/a)³; For this supplied interval, the layer starts at depth d_start = 0 mm when t_start = 0 min. Average front speed = Δdepth/Δtime = (d_end − d_start)/(t_end − t_start). This is the model's interval average, not a constant future speed, intrinsic diffusion coefficient or molecular flux. In a separate supplied endpoint file G has 80, 90, 100 s and H 90, 100, 110 s. Same material, solution and endpoint rule; temperature/stirring initially unknown. Later plan notes give equal temperature and standardised stirring, but the endpoint judgement used an instrument with resolution 10 s. All values are invented examples, not observations.
Complete task: Calculate both areas, volumes, ratios, centre distances, penetrated fractions and average front speed. Explain the zero-core/full-penetration case and why this says no more than the supplied geometry. Calculate both means/ranges, compare the overlapping lists and name a missing condition or measurement detail. Capture first work before the later sentence is released. Then judge whether equal temperature/stirring removes every limitation; explain how the coarse endpoint resolution affects confidence and propose a better recorded measure. Keep a valid cautious claim or revise an overstatement; retain the geometry. Staff initially withhold the sentence beginning “Later plan notes”.