Heterochromatin Study guides, Class notes & Summaries
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UofSC BIO302 Exam 1- Stephanie Ackerson Questions And Answers Graded A+
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A - Alanine (1 letter) 
Activation of enzymes through ligand binding: why would this be useful? - The binding of a ligand 
to an allosteric site of a multimeric enzyme often induces positive cooperativity, that is the binding of 
one substrate induces a favorable conformation change and increases the enzyme's likelihood to bind to 
a second substrate. 
Ala - Alanine (3 letter) 
Arg - Arginine (3 letter) 
Asn - Asparagine (3 letter) 
Asp - Aspartic Acid (3 letter) 
Barr body and relation to heter...
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USMLE STEP 1 BIOCHEMISTRY Questions and Answers with Complete Solutions 2024
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USMLE STEP 1 BIOCHEMISTRY 
Questions and Answers with 
Complete Solutions 2024 
histones are rich in which 2 AA's - ANSlysine & argenine 
Barr bodies (what, type of chromatin) - ANSinactive X chromosomes 
heterochromatin (highly condensed, sterically inaccessible) 
less condensed, transcriptionally active, sterically accessible chromatin - 
ANSeuchromatin 
DNA methylation at CpG islands - ANSrepresses transcription 
"CpG Methylation makes DNA Mute" 
DNA methylation (what is methylated and why?) ...
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Biology 1406 Exam 3 Questions with 100% Correct Answers | Latest Version 2024 | Expert Verified | Ace the Test
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Cell division is used for which of the following ? Reproduction of single-celled 
organisms, growth of multicellular organisms, repair and replacement of cells, and sperm and 
egg production 
Asexual and sexual reproduction differs in that sexual reproduction_____________ Can 
produce great variation among the offspring (Meiosis) 
Asexual Reproduction ____________ Produces offspring genetically identical to the parent 
(Mitosis) 
Most of the time, DNA is in the form of____________ Euchromatin 
W...
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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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CMB2001 Questions and Answer | Latest Update 2024/2025
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Describe how H3Lys9me heterochromatin is formed 
 ~~> H3Lys9me heterochromatin formation: Lys9 deacetylated by 
HDAC. Suvar39 then methylates lys9. Methylated lys9 is recognised by 
HP1 and then HP1 binds. HP1 has chromodomain - chromodomains 
often recognise and bind to methylated lys residues. Chromodomain 
on HP1 is specific for H3Lys9me (with di or tri methylated lys 9). Binding 
of HP1 is thought to compact nucleosome arrays as HP1s join together. 
What is gene expression? 
 ~~> ...
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BIOL 2300 Quizzes 1-7 Latest Update Graded A+
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BIOL 2300 Quizzes 1-7 Latest Update 
 
Graded A+ 
 
DNA is negatively charged because 
a. the ribose sugars of DNA are positively charged 
b. the ribose sugars of DNA are negatively charged 
c. the nitrogenous bases are negatively charged 
d. the phosphate backbone of DNA is negatively charged 
e. DNA is not acidic d. the phosphate backbone of DNA is negatively charged 
 
DNA replication is 
a. semi-conservative 
 
b. dispersive 
c. conservative 
 
d. error prone a. semi-conservative 
 
Define D...
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USABO Exam Questions and Answers 100% Verified
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USABO Exam Questions and Answers 100% VerifiedUSABO Exam Questions and Answers 100% VerifiedUSABO Exam Questions and Answers 100% VerifiedUSABO Exam Questions and Answers 100% Verified 
Eukaryote - ANSWER - An organism whose cells contain complex structures enclosed within membranes. The defining membrane bound structure thats sets them apart from prokaryotic cells is the nucleas or nuclear envelope within which the genetic material is carried. All species of large complex species are eukaryotes...
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USLME – BIOCHEMISTRY EXAM 2024 WITH 100% ACCURATE SOLUTIONS
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Histones are rich in what AAs? - ANSWER ☑☑Lysine and arginine (both + charge) 
 
When does histone synthesis occur? - ANSWER ☑☑S phase (along with DNA getting synthesized) 
 
Heterochromatin is _________, euchromatin is _________ - ANSWER ☑☑Inactive/condensed; active/accessible 
 
What allows mismatch repair enzymes to distinguish between old and new DNA strands in prokaryotes? - ANSWER ☑☑Methylation; old/template strands are methylated, new/daughter strands are unmethylated ...
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BIOL 2300 Quizzes 1-7 Correctly Answered Questions| UpToDate | Already Graded A+
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DNA is negatively charged because 
a. the ribose sugars of DNA are positively charged 
b. the ribose sugars of DNA are negatively charged 
c. the nitrogenous bases are negatively charged 
d. the phosphate backbone of DNA is negatively charged 
e. DNA is not acidic 
: d. the phosphate backbone of DNA is negatively charged 
DNA replication is 
a. semi-conservative 
b. dispersive 
c. conservative 
d. error prone 
: a. semi-conservative 
Define DNA helicase 
: unwinds DNA; that is, breaks the hydrog...
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ETS MAJOR FIELD TEST IN BIOLOGY 2024 QUESTIONS WITH CORRECT ANSWERS ALREADY PASSED AND VERIFIED
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Pyrimidine dimers formed in DNA due to UV radiation can be repaired by? 
SOS repair 
Double strand break repair 
Mismatch repair 
Photoreactivation repair (nucleotide excision repair) 
Base excision repair - CORRECT ANSWER Photoreactivation repair (nucleotide excision repair) 
Which of the following repair mechanisms uses methyl groups to distinguish between parental and daughter strands? 
 
Answers: 
Mismatch repair 
Photoreactivation repair (Nucleotide excision repair) 
SOS repair 
Doub...
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