Usmle biochemistry exam Study guides, Class notes & Summaries

First Aid USMLE Step 1: Biochemistry Exam Practice Questions and Answers (100% Pass) What is a nucleoside? What is a nucleotide? Which are the purines? Which are the pyrimidines? - Answer️️ -Side = base + (deoxy)ribose [sugar] Tide = base + (deoxy)ribose [sugar] + phosphaTe *Which are the purines?* "pure as gold" = Adenosine, Guanosine *Which are the pyrimidines?* "CUT the pyramid" = Cytosine, Uracil, Thymine In the nucleotide synthesis pathway, describe how purine synthesis ...

which histone ties DNA-histone nucleosome beads into more condensed structures? - Answer-H1 is DNA acidic or basic? - Answer-acidic what type of aa are histones made of? are they acidic or basic? - Answer-lysine and arginine; basic is heterochromatic more accessible or less accessible to TF? euchromatin? - Answer-less; more if a cell has a hyperchromatic or condensed nucleus is it undergoing transcription etc? - Answer-no what are chromosomes? during what part of the cell cycle ar...

infant with somnolence, vomiting, cerebral edema, decreased BUN, hyperammonemia - Answer-ornithine transcarbamoylase deficiency infantile cataracts, doesn't track objects, absent social smile - Answer-galactokinase deficiency infantile cataracts, hepatomegaly, jaundice, failure to thrive - Answer-uridyltransferase deficiency causes of Down syndrome - Answer-1) meiotic nondisjunction (95%) 2) unbalanced robertsonian translocation (extra arm on Ch 21) 3) mosaic trisomy 21 treatment ...

©THEBRIGHT EXAM STUDY SOLUTIONS 8/19/2024 2:07 PM RNA Polymerase III Describe the processing of hmRNA to form an mRNA and where does this process occur - answer Lac operon - answerLow glucose: hi AC activity -> hi cAMP -> activation of CAP induces transcription only if repressor is not bound High lactose: unbinds repressor from the opersator and increases transcription Nucleotide excision repair - answerexcision endonucleases release oligonucleotide containing damaged bases. DNA p...

©THEBRIGHT EXAM STUDY SOLUTIONS 8/19/2024 2:07 PM cherry macula, neurodegeneration, foam cells, hepatomegaly - answerniemann-pick (sphyngomyelin) cherry macula, neurodegenration, lysosomes with onion skin, NO hepatisplenomegaly - answertay-sachs (GM2 ganglioside) causes of albinism - answertyrosine transporter defect tyrosine hydroxylase deficiency lack of migration of neural crest cells (melanocytes) where do preganglionic parasympathetic neurons originate? - answernuclei of cranial ne...

Pharmacology PreTestTM Self-Assessment and Review Notice Medicine is an ever-changing science. As new research and clinical experience broaden our knowledge, changes in treatment and drug therapy are required. The authors and the publisher of this work have checked with sources believed to be reliable in their efforts to provide information that is complete and generally in accord with the standards accepted at the time of publication. However, in view of the po...

In this file you will find a Rapid Revision Summary for the Biochemistry part of Krok 1. A part of the summary is based on most frequent asked questions as well as ministery questions.