The Cosmology of the Living Cell posits that the observable universe is structurally anddynamically isomorphic to a living eukaryotic human cell, with a universal scaling factorκ ≈ 1018–1020. This framework unifies General Relativity (GR) and Quantum Mechan-ics (QM) by deriving gravitation from cytoskeletal binding forces (σcyt), cosmic expansionfrom osmotic turgor pressure of the cosmic cytosol (Posm), and quantum coherence frommicrotubule dynamics via the Orch-OR mechanism. The modified Einstein field equationsincorporate these biological terms, while a scale-invariant hyperbolic wave equation bridgesquantum microtubule states to cosmic vacuum fluctuations.The unified quantum-gravity equation replaces the classical energy-momentum tensorwith its expectation value over microtubule wave functions, yielding a singularity-free theorythat preserves causality and resolves issues like the Hubble tension mechanically. Specificquantitative predictions include a time-dependent dark energy equation of state w(z) ≈−1 + 0.05z for z < 1, gravitational wave amplitude boosts of 5–10% at low frequencies(f < 10−4 Hz), and explanations for DESI LRG1 anomalies at zeff ≈ 0.51. The theory istestable with JWST, DESI, Euclid, and LISA data. Numerical estimates place σcyt ≈ 10−10–10−9 Pa and Posm ≈ 10−10 J/m³, consistent with observed cosmological densities afterscaling.This work provides a biologically grounded alternative to standard models, with poten-tial applications in vacuum energy extraction and quantum technologies. All content wasreviewed and verified by the author.