Biochemistry usmle step 1 - Study guides, Class notes & Summaries

Achondroplasia involves what defect? – Cell-signaling defect of fibroblast growth factor (FGF) receptor 3 Marfan's syndrome involves a mutation in what? – Fibrillin gene Xanthine, hypoxanthine and uric acid are all what type of base? – Purine What is the rate limiting step in Purine de novo synthesis? – PRPP step via glutamin PRPP amidotranferase PRPP amidotransferase inhibited by what downstream products in purine synthesis? – IMP, GMP, AMP and puring analogs Allopurinola a...

First Aid USMLE Step 1: Biochemistry | Questions and answers | 2024/25

Biochemistry USMLE Step 1 Achondroplasia involves what defect? – Cell-signaling defect of fibroblast growth factor (FGF) receptor 3 Marfan's syndrome involves a mutation in what? – Fibrillin gene Xanthine, hypoxanthine and uric acid are all what type of base? – Purine What is the rate limiting step in Purine de novo synthesis? – PRPP step via glutamin PRPP amidotranferase PRPP amidotransferase inhibited by what downstream products in purine synthesis? – IMP, GMP, AMP and pu...

1. Determine the number of ATP molecules, which are formed in Krebs cycle at the conversion of isocitric acid to fumaric acid (I) and to succinyl CoA (II) respectively: A) I -7,0; II - 5,5 B) I - 5; II - 3,5 C) I - 6,5; II - 4,5 D) I - 7,5; II - 5 E) I - 7; II - 3 2. In which stages of citric acid cycle is CO2 formed? 1) Izocitrate - α-Ketoglutarate 2) Succinate - Fumarate 3) α-Ketoglutarate -Succinil-CoA 4) Fumarate – Malate 5) Malate –Oxaloacetate A) 1,3 B) 2,4 C) 1,4 D) ...

Achondroplasia involves what defect? (Ans- Cell-signaling defect of fibroblast growth factor (FGF) receptor 3 Marfan's syndrome involves a mutation in what? (Ans- Fibrillin gene Nucleoside + phosphate= ? (Ans- Nucleotide Adenine and Guanine are in what type of nucleic acid? (Ans- Purines Cytosine, Uracil and Thyamine arein what kind of nucleic acid? (Ans- Pyrimidines Xanthine, hypoxanthine and uric acid are all what type of base? (Ans- Purine How many hydrogen bond...

USMLE STEP 1 RAPID REVIEW EXAM 2024 WITH 100% CORRECT ANSWERS abdominal pain, ascites, hepatomegaly - correct answer Budd-Chiari syndrome Familial hypercholesterolemia - correct answer achilles tendon xanthoma adrenal hemorrhage, hypotension, DIC - correct answer Waterhouse-Friderichsen syndrome biochemistry of Marfan's syndrome - correct answer fibrillin defect posthepatic venous thrombosis - correct answer Budd-Chiari syndrome Familial hypercholesterolemia biochemistry - cor...

Biochemistry USMLE step 1 questions correctly 2023histones are rich in which 2 AA's lysine & argenine Barr bodies (what, type of chromatin) inactive X chromosomes heterochromatin (highly condensed, sterically inaccessible) less condensed, transcriptionally active, sterically accessible chromatin euchromatin DNA methylation at CpG islands represses transcription "CpG Methylation makes DNA Mute" DNA methylation (what is methylated and why?) template strand c...

First Aid USMLE Step 1: Biochemistry questions with complete solution 2023.2024

"elfin" facies, ID, hypercalcemia (↑ Vit. D sensitivity), verbal & musical ability, extreme friendlinessWilliams syndrome "mewing," microcephaly, ID, VSDcri-du-chat syndrome (Debranching enzyme) (Myophosphoeylase) ↑ glycogen in muscle→ painful muscle cramps, myoglobinuria (red urine) with strenuous exercise, arrhythmia normal blood glucoseGlycogen Storage Disease type V (McArdle) ↑ HDL in a very unhealthy personEtOH → ↑ HDL synthesis ↑ nuchal translucency and hypoplast...

Biochemistry Section-USMLE Step 1