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IMF-082-03-0001-en	How does the restriction point commit a cell to division, and why does loss of retinoblastoma control promote inappropriate proliferation?	Cyclin-dependent kinases phosphorylate retinoblastoma protein, releasing E two F to induce DNA-replication genes, so the cycle proceeds despite later mitogen withdrawal; losing this restraint removes a key brake.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0002-en	What makes cell-cycle transitions directional rather than reversible?	Cyclin-dependent kinases are activated by stage-specific cyclins, and timed ubiquitin-mediated destruction of cycle components makes each transition one-way.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0003-en	How is DNA replication restricted to once, and only once, per cycle?	Origins are licensed before synthesis phase by loading helicase components and then activated by synthesis-phase kinases; activation prevents relicensing until the next cycle.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0004-en	How do the DNA-damage checkpoint kinases and p fifty-three decide between repair and death?	Ataxia telangiectasia mutated kinase responds to double-strand breaks and its related kinase to replication stress; their effectors modify p fifty-three, which induces p twenty-one for repair time or promotes apoptosis if damage is severe.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0005-en	Why is entry into mitosis switch-like, and what does that prevent?	Cyclin B-kinase one stays inactive until phosphatases remove inhibitory phosphate, then positive feedback flips the cell rapidly into mitosis, preventing an unstable mixture of interphase and mitotic states.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0006-en	How does the spindle-assembly checkpoint link correct kinetochore attachment to sister-chromatid separation?	Anaphase is blocked while kinetochores are unattached or misattached; once all are correct, the anaphase-promoting complex targets securin and mitotic cyclins for degradation, releasing separase to cleave cohesin.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0007-en	Why does gamete aneuploidy rise with maternal age?	Maternal meiotic arrest lasting many years contributes to the age-related rise in aneuploidy, which arises when nondisjunction produces gametes with abnormal chromosome number.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0008-en	How do symmetric and asymmetric stem-cell divisions differ in their effect on the stem-cell pool?	A symmetric division can expand or deplete the pool, whereas an asymmetric outcome preserves one stem-like daughter while producing a committed daughter.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0009-en	Why can cellular senescence be beneficial acutely yet harmful when chronic?	Senescent cells stay metabolically active and release cytokines, proteases, and growth factors; acutely this can constrain tumours and aid wound repair, but chronic accumulation drives inflammation, fibrosis, and ageing.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0010-en	Why is telomere length not a simple biological clock?	Although incomplete lagging-strand replication shortens telomeres, length is also influenced by inheritance, cell history, stress, and measurement method, and telomerase extends telomeres in germ cells and many stem cells.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0011-en	Why should experimenters not equate every dying cell with apoptosis?	Necrotic death can be regulated through necroptosis, pyroptosis, or ferroptosis with distinct machinery, and autophagy may accompany death without causing it, so morphology, markers, and mechanism must be distinguished.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0012-en	Why does colocalisation of two labelled molecules under a light microscope not prove that they interact?	Light-microscope resolution cannot establish direct molecular interaction, so claims need controls such as positive and negative samples, omitted primary antibody, matched acquisition settings, and independent validation.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0013-en	Why can DNA-content flow cytometry not alone separate gap two from mitosis, and what marker helps?	DNA content distinguishes gap one, synthesis, and gap two or mitotic populations but groups the last two together; phosphorylation of histone H three can mark mitosis.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending
IMF-082-03-0014-en	Why does rescue with a perturbation-resistant construct strengthen a loss-of-function experiment?	Inhibitors, RNA interference, gene editing, and targeted degradation all have off-target effects and compensatory responses; restoring the phenotype with a resistant construct ties the effect to the intended target.	Integrated Medical Foundations; chapter 82, TTS module 3; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: db62547f79ab9418d2c2e3c6490e33385c272b1f925bec9840c59970b3912f33; editorial review pending	imf lang::en chapter::082 module::082-03 review::pending