STEPTRACKERHIGH-YIELD RAPID REVIEW | PATHOLOGY · BIOCHEMISTRY · MICROBIOLOGY · IMMUNOLOGY · PHARMACOLOGY

USMLE Step 1 Rapid Review

PART IMolecular & Cell BiologyChapters 01–04 · 17 pages
01

DNA & Nucleotides

1.01Chromatin & epigeneticsHeterochromatin vs euchromatin · methylation · histone acetylation · imprinting basisOpen →1.02Nucleotide synthesisPurine vs pyrimidine de novo · PRPP · ribonucleotide reductase · drugs that block each stepOpen →1.03Purine salvage & nucleotide disordersHGPRT · Lesch-Nyhan · ADA deficiency · orotic aciduria · goutOpen →1.04DNA replicationFork enzymes · topoisomerases · telomerase · prokaryote vs eukaryote polymerasesOpen →1.05DNA mutations & repairMutation types · NER, BER, MMR, NHEJ, HR · xeroderma, Lynch, BRCAOpen →
03

Cell Biology

3.01Cell cyclePhases · CDKs and cyclins · Rb and p53 checkpoints · labile, stable, permanentOpen →3.02Organelles: ER, Golgi, peroxisome & proteasomeRER vs SER · Golgi sorting · Zellweger, Refsum · ubiquitin–proteasomeOpen →3.03Cytoskeleton, cilia & motor proteinsMicrofilaments, intermediate filaments, microtubules · dynein · KartagenerOpen →3.04Membranes, Na⁺/K⁺-ATPase & signalingPump and digoxin · G-protein pathways · receptor tyrosine kinases · JAK-STATOpen →3.05CollagenTypes I–IV · synthesis steps inside and outside the cell · scurvy, OI, Ehlers-Danlos, MenkesOpen →3.06Elastin, fibrillin & connective tissue disordersElastin · fibrillin and Marfan · α1-antitrypsin · homocystinuria vs MarfanOpen →
PART IIGeneticsChapters 05 · 9 pages
PART IIINutritionChapters 06 · 5 pages
PART IVMetabolismChapters 07–10 · 20 pages
08

Carbohydrate Metabolism

8.01GlycolysisHexokinase vs glucokinase · PFK-1 · pyruvate kinase · RBC 2,3-BPGOpen →8.02Pyruvate fates & PDHFour fates of pyruvate · PDH cofactors · PDH deficiency · arsenicOpen →8.03TCA cycle & electron transportTCA steps and products · complexes I–V · inhibitors · uncouplersOpen →8.04GluconeogenesisFour bypass enzymes · substrates · von Gierke link · alcoholOpen →8.05HMP shunt & NADPHOxidative and nonoxidative phases · G6PD · NADPH uses · respiratory burstOpen →8.06Fructose, galactose & sorbitolEssential fructosuria vs fructose intolerance · galactosemia · aldose reductase · lactaseOpen →8.07Glycogen & glycogen storage diseasesGlycogen synthesis and breakdown · von Gierke · Pompe · Cori · McArdleOpen →
09

Amino Acid Metabolism

9.01Urea cycle & hyperammonemiaUrea cycle steps · OTC vs CPS I deficiency · ammonia treatmentOpen →9.02Amino acid derivativesTyrosine → catecholamines · tryptophan → serotonin, niacin · heme, NO, histamine, GABAOpen →9.03Phenylalanine & tyrosine disordersPKU · BH4 deficiency · alkaptonuria · albinism · tyrosinemiaOpen →9.04Homocystinuria, MSUD & other aminoacidopathiesHomocystinuria types · MSUD · organic acidemias · cystinuria · HartnupOpen →9.05Heme synthesis & porphyriasALA synthase · lead poisoning · AIP · PCT · bilirubin handoffOpen →
10

Lipid Metabolism

10.01Fatty acid synthesis & oxidationCitrate shuttle · acetyl-CoA carboxylase · carnitine shuttle · MCAD deficiencyOpen →10.02Ketone bodiesSynthesis in liver · use by brain and muscle · DKA vs starvation vs alcoholOpen →10.03Cholesterol & lipoproteinsHMG-CoA reductase · apolipoproteins · chylomicron to LDL pathwayOpen →10.04Familial dyslipidemiasTypes I–V · LPL, LDL receptor, ApoE · xanthomas, pancreatitisOpen →10.05Lysosomal storage diseasesSphingolipidoses · mucopolysaccharidoses · enzyme and inheritanceOpen →
PART VFinal Rapid-Fire ReviewChapters 11 · 4 pages