Biochemistry usmle step 1 Study guides, Class notes & Summaries

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...

QUESTIONS AND ANSWERS

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) ...

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

Biochemistry Section-USMLE Step 1

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...

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

USMLE Step 1- Biochemistry Exam Questions & Answers 2023/2024 Histones are rich in which 2 amino acids? - ANSWER-Lysine Arginine What histone protein is responsible for binding to the nucleosome and to the "linker" DNA thereby stabilizing the chromatin fiber? - ANSWER-H1 When does DNA and histone synthesis occur in the cell cycle? - ANSWER-S-phase Will the following be increased or decreased or neutral in heterochromatin? methylation acetylation - ANSWER-methylation increased ...

USMLE Step 1- Biochemistry Questions and Answers(2022)Answered test Histones are rich in which 2 amino acids? Ans- Lysine Arginine What histone protein is responsible for binding to the nucleosome and to the "linker" DNA thereby stabilizing the chromatin fiber? Ans- H1 When does DNA and histone synthesis occur in the cell cycle? Ans- S-phase Will the following be increased or decreased or neutral in heterochromatin? methylation acetylation Ans- methylation increased acety...

USMLE STEP 1 BIOCHEMISTRY Questions and Answers with Complete Solutions 2024 Achondroplasia involves what defect? - ANSCell-signlaling defect of fibroblast growth factor (FGF) receptor 3 Marfan's syndrome involves a mutation in what? - ANSFibrillin gene Nucleoside + phosphate= ? - ANSNucleotide Adenine and Guanine are in what type of nucleic acid? - ANSPurines Cytosine, Uracil and Thyamine arein what kind of nucleic acid? - ANSPyrimidines Xanthine, hypoxanthine and uric acid are all w...