Category: Science
-
How to Learn Plant Transitory Starch Turnover: From Daytime Chloroplast Storage to Night-Time Phosphorylation, Maltose Export and Carbon Budgeting
Distinct learning-progression job: Learn how leaves convert part of daytime photosynthetic carbon into transient chloroplast starch, initiate and grow starch granules, then mobilize them at night through reversible glucan phosphorylation, β-amylase/debranching chemistry and maltose export while adjusting degradation rate so carbon reserves approach—but usually do not reach—exhaustion near dawn. Canonical boundary: Photosynthesis and Respiration remains…
-
How to Learn Human Mitochondrial DNA Replication: From TFAM Nucleoids to POLG–TWINKLE Replisomes, RNA Priming and Copy-Number Control
Distinct learning-progression job: Learn how mammalian mitochondria maintain hundreds to thousands of copies of a small circular genome by connecting nucleoid packaging, transcription-derived primer formation, TWINKLE helicase, POLG polymerase, mtSSB protection, heavy- and light-strand replication, termination and mtDNA copy-number homeostasis. Canonical boundary: Mitochondria and Mitochondrial Dynamics remains the broad owner of mitochondrial physiology; Mitochondrial TOM–TIM…
-
How to Learn Centriole Duplication: From PLK4 Recruitment to STIL–SAS6 Cartwheel Assembly, Procentriole Growth and Duplication Control
Distinct learning-progression job: Learn how animal cells build exactly one daughter centriole beside each existing centriole by following PLK4 recruitment and self-regulation, STIL phosphorylation, SAS6 cartwheel symmetry, CPAP-linked microtubule growth, daughter maturation and the cell-cycle licensing logic that prevents both centriole loss and overduplication. Canonical boundary: Cell Cycle and Checkpoints remains the broad owner of…
-
How to Learn Eukaryotic Nucleotide Excision Repair: From XPC Damage Sensing to TFIIH Verification, Dual Incision and Repair Synthesis
Distinct learning-progression job: Learn how eukaryotic cells remove bulky, helix-distorting DNA lesions by distinguishing global-genome lesion recognition from transcription-coupled recognition, then following both routes into one shared TFIIH–XPA–RPA pre-incision machine, dual incision by XPF–ERCC1 and XPG, repair synthesis and ligation. Canonical boundary: DNA Replication and Repair remains the broad owner of genome maintenance; Bacterial Nucleotide…
-
How to Learn Wnt–β-Catenin Signalling: From PORCN and Frizzled–LRP6 to the Destruction Complex, Nuclear β-Catenin and Cell-Fate Control
Distinct learning-progression job: Build reasoning from the question “how can a secreted Wnt protein change whether β-catenin is destroyed?” to Wnt lipidation and secretion, Frizzled–LRP5/6 receptor assembly, Dishevelled/LRP6 signalosome formation, Axin–APC–CK1–GSK3 destruction-complex control, β-TrCP-dependent turnover, β-catenin stabilization and TCF/LEF-dependent transcription, while keeping receptor clustering, pathway amplification, R-spondin receptor maintenance, cell-adhesion β-catenin and non-canonical Wnt outputs…
-
How to Learn Eukaryotic Non-Homologous End Joining: From Ku–DNA-PK End Capture to Artemis Processing, XRCC4–XLF Synapsis and Ligase IV Repair
Distinct learning-progression job: Build reasoning from the question “how can a cell reconnect a broken chromosome when no intact template is immediately available?” to Ku70/Ku80 end capture, DNA-PKcs recruitment and synapsis, DNA-end protection versus processing, Artemis and end-cleaning enzymes, polymerase μ/λ gap filling, XRCC4–XLF/PAXX scaffolding, DNA ligase IV sealing, pathway choice against resection/HR, and the…
