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Mitochondria — the cell's power-plant city 🏭
Mitochondria are the powerhouses of the cell — like tiny nuclear reactors humming inside every cell, converting the 'fuel' (glucose + O₂) into usable currency (ATP).…
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A biochemist studies a mutant strain of yeast that cannot grow on glucose alone, but grows normally on pyruvate. Enzyme assays show wild-type activity for pyruvate dehydrogenase and every enzyme of the citric acid cycle. Glycolytic intermediates upstream of pyruvate accumulate in the mutant.
Which enzyme is most likely defective in the mutant strain?
A rigid 2.0 L vessel contains 0.50 mol of an ideal gas at 300 K. The gas is heated at constant volume until the pressure doubles.
What is the final temperature of the gas?
The romantic view of the lone inventor persists in popular culture, but the historical record tells a subtler story. Nearly every celebrated breakthrough — the telephone, the airplane, the transistor — was preceded by a decade of overlapping work by rivals converging on the same problem. What we call "invention" is often the moment a public credit system catches up with a private consensus.
The author's primary purpose in this paragraph is to:
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One MCAT idea usually lives across 3 subjects. PictureMed maps the biggest cross-discipline threads so you stop siloing biology, chemistry, and physics.
Start free — 1 theme unlocked instantlyThe Action Potential Is an Electrochemistry Problem
Neurons fire because ion pumps set up a battery — every biology fact about firing rate maps onto a chemistry equation.
→ Resting potential is the Nernst equation applied to K+ leak channels; threshold and firing are Ohm's law on a leaky capacitor.
Oxygen From Air to Mitochondrion
Every breath crosses 4 disciplines: fluid dynamics, gas laws, protein binding, and cellular respiration.
The Body Is a 24/7 Buffered Solution
Blood pH stays at 7.4 ± 0.05 through three overlapping systems — one chemistry, one respiratory, one renal.
Enzyme Kinetics = Rate Laws With Extra Steps
Michaelis-Menten is just chemistry's rate law wearing a lab coat — the same math predicts drug pharmacology.
ATP Is a Thermodynamics Problem
The Second Law says entropy increases — cells fight this by coupling reactions with a big negative ΔG.
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