Biochemistry usmle - Study guides, Class notes & Summaries

a 26 page cheat sheet that provides concepts about biochemistry, genetics, immunology and some gastro, in a way that is concise, brief and easy to understand. Notes taken from class and formulated for studying for USMLE Step 1 exam 2022-2023

QUESTIONS AND ANSWERS

BIOCHEMISTRY USMLE STEP 1 EXAM QUESTIONS WITH CORRECT ANSWERS

Biochemistry USMLE step 1 Questions and Answers with Verified Solutions (New Update 2023) Biochemistry USMLE step 1 Questions and Answers with Verified Solutions (New Update 2023)

Biochemistry USMLE Practice 2022 Questions and Answers thrombocytopenia Ans- deficiency of platelets in the blood. This causes bleeding into the tissues, bruising, and slow blood clotting after injury. A 16 year old boy presented to a doctor by his mother for the injury which he had recently during cycle riding. On examination doctor noticed the loose, overly-flexible joints, smooth or stretchy, easily-bruised skin and abnormal wound healing and scar formation. This is the characteri...

Biochemistry USMLE step 1 Question with complete solution 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?) templ...

. 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) 3...

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...

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...