Histone acetylation Study guides, Class notes & Summaries
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UNE Medical Biochemistry Midterm Review Already Graded A
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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...
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Biochemistry USMLE step 1: Updated Solution: Guaranteed A+ Guide Solution
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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...
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USMLE step 1 Biochemistry exam 2023 with 100% correct answers
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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...
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UNE biochemistry midterm review questions and answers with complete solutions
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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...
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USMLE Biochemistry Exam Questions with Correct Answers
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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...
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USMLE Step 1- Biochemistry Exam Questions & Answers 2023/2024
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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 ...
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USMLE Step 1- Biochemistry Questions and Answers(2022)Answered test
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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...
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CBSE FINAL EXAM 2023/2024 GRADED A LATEST VERSION
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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...
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UCI BIO 93 Final exam 2024 with 100% correct answers
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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...
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GCU BIO 181 FINAL EXAM 4 with Complete Solutions
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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...
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