Histone acetylation Study guides, Class notes & Summaries

UNE Medical Biochemistry Midterm Review Already Graded A A family presents for genetic counseling. The couple has two female children who are alive and well; however, their infant son recently died in the nursery with severe hemolysis (lysis of red blood cells) and jaundice. The wife recalls she lost a brother in infancy with severe hemolysis, induced after a viral infection. The physician suspects a glucose-6-phosphate dehydrogenase deficiency, this would result in a deficiency in which of the...

histones are rich in which 2 AA's (Ans- lysine & argenine Barr bodies (what, type of chromatin) (Ans- inactive X chromosomes heterochromatin (highly condensed, sterically inaccessible) less condensed, transcriptionally active, sterically accessible chromatin (Ans- euchromatin DNA methylation at CpG islands (Ans- represses transcription "CpG Methylation makes DNA Mute" DNA methylation (what is methylated and why?) (Ans- template strand cytosine and adenine are methylate...

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 DNA methylation at CpG islands - correct answer represses transcription "CpG Methylation makes DNA Mute" DNA methylation (what is methylated and why?) - correct answer tem...

Under low energy conditions, AMP will bind to phosphofructokinase I and glycogen phosphorylase at site unique to the active site. This enhances the activity of these enzymes. This is an example of which of the follow types of enzyme regulation? correct answer: Allosteric activation An example of enzyme activation by cleavage is best illustrated by which of the following? correct answer: Activation of chymotrypsinogen to chymotrypsin Children with cystinosis have growth delay and both ren...

USMLE Biochemistry Exam Questions with Correct Answers Heterochromatin - ANSWER Highly Condensed DNA Transcriptionally inactive Ex. Barr bodies (inactivated X chromosomes) Euchromatin - ANSWER Less condensed DNA Transcriptionally active DNA Methylation - ANSWER Occurs at *CpG Islands* to repress transcription 'CpG Methylation Makes DNA MUTE' Template strand *cytosine* and *adenine* are methylated, which allow mismatch repair enzymes to distingu...

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 ...

CBSE FINAL EXAM 2023/2024 GRADED A LATEST VERSION A 66-year-old woman comes to the physician because of severe lower back pain. She is otherwise healthy with well-controlled hypertension and hyperlipidemia. She does not drink, but has smoked one pack of cigarettes per day for the past 20 years. An x-ray of the lumbar spine shows an anterior wedge compression fracture of L1. Results of dual-energy X-ray absorptiometry (DEXA) scan shows substantially decreased bone density in the region...

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...

What is an example of incomplete dominance? - correct answer A red and white snapdragon making a pink offspring What is an example of co-dominance? - correct answer Blood cells. What is Pleiotropy? - correct answer When a gene affects more than one phenotypic character. What is the norm of reaction? - correct answer The range of phenotypic possibilities What are some example of polygenic inheritance? - correct answer Skin color and height Norms of reactions are broadest...

The tryptophan operon is a repressible operon that is: - ANSWER-Turned off whenever tryptophan is added to the growth medium. The lactose operon is likely to be transcribed when: - ANSWER-The cyclic AMP and lactose levels are both high within the cell. For a repressible operon to be transcribed, which of the following must occur? - ANSWER-RNA polymerase must bind to the promoter, and the repressor must be inactive. Which of the following, when taken up by the cell, binds to the represso...