READING COMPREHENSION · AUTHOR ANALYSIS
Infer purpose and stance from sustained action, then keep every answer inside the boundary the author actually defends.
THE AUTHOR LOOP
Use a verb for what the author repeatedly does—explains, contrasts, qualifies, evaluates, or argues—not merely the topic discussed.
Build stance from repeated wording, concessions, structure, and evidence use. One vivid adjective cannot carry the whole answer.
Ask what the author accepts, what is deliberately withheld, and whether an option turns a bounded claim into certainty or motive.
THE SIXTH READING OBJECTIVE
This route depends on explicit evidence and the reasoning chain. It adds RC-SCI-AUT-01 without inventing an author's emotion, motive, or certainty from topic alone.
PURPOSE
Cyanobacterial circadian clocks
What the passage discussesEvaluate what layered reconstitution can establish
What the author does with the topicProve that simplified models replace living systems
A motive the structure rejectsSTANCE + EMPHASIS
Recasts reconstitution as a question about which clock layer has been rebuilt.
Interested in reduction, wary of the miniature-organism metaphor.Uses kaiABC genetics to establish cellular necessity and the earlier feedback model.
Treats the model as reasonable evidence, not a final mechanism.Presents the three-protein experiment as a change in level from cell to biochemical core.
Regards the result as decisive for one autonomous rhythm.Shows how reduction reveals an ordered sequence hidden by a total measurement.
Prefers state-resolved explanation over a vague interaction claim.Connects ATPase rate with period while distinguishing a pacemaker from the whole oscillator.
Supports the ATPase proposal with explicit caution.Names the input and output functions omitted by the minimal reaction.
Uses block labels as questions rather than sealed compartments.Introduces the intact in vitro clock as a test of interactions hidden from the smaller mixture.
Treats added complexity as explanatory when it restores a defined function.Uses phase-resetting results to revise a strictly one-way input–oscillator–output diagram.
Finds the cross-model agreement strengthening but not exhaustive.Defines nested models as complementary tests whose conclusions must be transferred carefully.
Neither reductionist triumphalism nor dismissal of simplified models.CLAIM BOUNDARIES
KaiABC and ATP are sufficient for an autonomous KaiC phosphorylation rhythm.
KaiABC alone performs every input, output, metabolic, and cellular clock function.
kaiABC genes are necessary for the measured cellular circadian rhythm in the tested cyanobacterium.
A loss-of-function phenotype by itself identifies the biochemical reaction that keeps time.
KaiC ATPase activity is associated with and helps set circadian period.
The average ATPase rate is the entire oscillator, independent of molecular state and partners.
SasA and CikA shape output robustness and phase resetting in reconstituted systems.
Every environmental cue or genome-wide response has been recreated in a purified reaction.
THIRD PASSAGE · FROZEN TRAIL
The passage is original DAT TRAIN writing. Its 20 scientific claims map by paragraph to six primary studies spanning cellular genetics, minimal reconstitution, molecular timing, expanded output, and entrainment.
Original DAT TRAIN passage independently synthesized from the frozen primary-research source trail. No source wording, official examination content, memorized test material, or proprietary practice content was reproduced.
ONE PASSAGE · SIXTEEN AUTHOR AUDITS
The passage and author-move map remain beside every question. After checking, each option exposes its classification, rationale, exact quotation, paragraph anchor, and frozen offsets.
Question order and all five answer options are shuffled when you begin. The correct answer stays attached to the same underlying choice.
SOURCE-FORM BOUNDARY
The frozen source form preserves the three passage sets atomically at 16 + 18 + 16 questions. The allocation and author-lens mix are DAT TRAIN construction choices, not published ADA item-type weights.
The source form remains draft and uncalibrated. It does not claim representative-device results, human approval, or official score conversion.
The mixed-retrieval route adds strategy switching, passage-aware navigation, and transparent open-clock pacing without changing these source sets. The completion form provides delayed-feedback delivery and recovery.
Continue to the mixed-retrieval circuit →