Biochemistry Section-USMLE Step 1 2024 Questions and Answers

Biochemistry Section-USMLE Step 1 2024 Questions and Answers which histone ties DNA-histone nucleosome beads into more condensed structures? - answerH1 is DNA acidic or basic? - answeracidic what type of aa are histones made of? are they acidic or basic? - answerlysine and arginine; basic is heterochromatic more accessible or less accessible to TF? euchromatin? - answerless; more if a cell has a hyperchromatic or condensed nucleus is it undergoing transcription etc? - answerno what are chromosomes? during what part of the cell cycle are they found? in what pathologic state would you see a lot of chromosomes? - answerhighly condensed forms of DNA; mitosis; neoplasia- highly dividing and thus hyperchromatic what experiment is chromosomes used for? - answerkaryotyping are histones in heterochromatin or euchromatin more methylated? which had more acetylated histones? - answerheterochromatin; euchromatin what does guanine have on it? - answera ketone what does thymine have on it? - answera methyl deamination of what pyrimidine makes what? - answercytosine to uracil in what genetic code is uracil found in? in replace of what? - answeruracil; thymine