Usmle biochemistry exam - Study guides, Class notes & Summaries

Biochemistry USMLE Step 1 ACTUAL Exam Questions and CORRECT Answers histones are rich in which 2 AA's - CORRECT ANSWER- lysine & argenine Barr bodies (what, type of chromatin) - CORRECT ANSWER- inactive X chromosomes heterochromatin (highly condensed, sterically inaccessible) less condensed, transcriptionally active, sterically accessible chromatin - CORRECT ANSWER- euchromatin

Biochemistry USMLE Step 1 UPDATED ACTUAL Exam Questions and CORRECT Answers Achondroplasia involves what defect? - CORRECT ANSWER- Cell-signlaling defect of fibroblast growth factor (FGF) receptor 3 Marfan's syndrome involves a mutation in what? - CORRECT ANSWER- Fibrillin gene Nucleoside + phosphate= ? - CORRECT ANSWER- Nucleotid

USMLE- BIOCHEMISTRY- EXAM 3 REVIEW | WITH 100% CORRECT ANSWERS | LATEST UPDATE | GRADED A+ 1 Q Which of the following statements about Purine and Pyrimidine biosynthesis and metabolism is correct (or True)? (Select all that apply) A: Antifolate drugs and Glutamine analogs block purine nucleotide biosynthesis. B: PRPP (phosphoribosylpyrophosphate) synthase phosphorylates the anomeric OH group of Ribose 5’-phosphate. C: cAMP and cGMP feedback regulate their formation from IMP (Ino...

BIOCHEMISTRY USMLE STEP 1 EXAM QUESTIONS WITH CORRECT ANSWERS Achondroplasia involves what defect? -ANS_ Cell-signlaling defect of fibroblast growth factor (FGF) receptor 3 The splicesome exsises introns or exons? -ANS_ Introns What chemotherap agent inhibits thymidylate synthase (therefore decreasing pyrmidine synthesis for DNA)? -ANS_ 5-fluorouracil

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...

What changes a cytosine into a uracil? Which base nucleotides contain an extra amino group? Which base nucleotide has an extra methyl group? What are the purines?Pyrimidines? How does Methyltrexate work on DNA? If a sample of DNA has 10% G, how much is the T %? Which DNA has a higher melting point?Why?Define melting point. What is the charge of Histones?What 2 AA are histones abundant in? what causes chromatin to be tightly packaged?Name of this type of chromatin? (active or inactive)If ...

BIOCHEMISTRY USMLE STEP 1 EXAM QUESTIONS WITH CORRECT ANSWERS

Biochemistry USMLE Step 1 Exam Questions With Answers histones are rich in which 2 AA's -ANSWER- lysine & argenine Barr bodies (what, type of chromatin) -ANSWER- inactive X chromosomes heterochromatin (highly condensed, sterically inaccessible) less condensed, transcriptionally active, sterically accessible chromatin -ANSWER- euchromatin DNA methylation at CpG islands -ANSWER- represses transcription "CpG Methylation makes DNA Mute" DNA methylation (what is methylated and why...