Heterochromatin Study guides, Class notes & Summaries

Cell division is used for which of the following ? - Answer 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_____________ - Answer Can produce great variation among the offspring (Meiosis) Asexual Reproduction ____________ - Answer Produces offspring genetically identical to the parent (Mitosis) Most of the time, DNA is in the...

histones - proteins that DNA wraps around to form chromatin and chromosomes condensins - protein complexes that form rings around DNA, organizing chromosomes into loops chromatin - any complex of DNA and protein found in a nucleus of a cell nucleosomes - structure that forms by winding of DNA around histones, resemble beads on a string heterochromatin - tightly condensed so no room for transcription factors so no expression euchromatin - relaxed so room for transcription factors so ex...

1. Highly condensed chromatin that is transcriptionally inactive is called - Answer-Heterochromatin 1. If you were to make a synthetic form of DNA in which the phosphate group is substituted by a chemical group exhibiting a net positive charge, the resulting synthetic DNA" - Answer-Would likely not be packaged by histones The major structural proteins in human chromatin are known as - Answer-histones The main function of the centromere is to - Answer-Allow the proper distribution of ch...

What is a megabase (Mb)? correct answers 1 million bases Is there generally a difference in the amounts of DNA when comparing the genome sizes of viruses --> prokaryotes --> eukaryotes? How does this comparison relate to complexity of these organisms? Be careful. correct answers viruses < prokaryotes < eukaryotes genome sizes does not correlate with complexity, just because an organism has a bigger genome size does not make it more complex. Eukaryotes can differ dramatically...

Heterochromatin correct answers form of DNA - tightly coiled, usually peripherally placed in the nucleus, dark-staining, inactive - not involved in RNA synthesis Euchromatin correct answers form of DNA - partially/fully uncoiled, centrally placed, light staining, active - involved in RNA synthesis Basophilic correct answers stains readily with basic dyes (e.g haemotoxylin is a basic dye that stains the nucleus - which is basophilic - blue/purple) Nuclear envelope correct answers double-...

USLME Biochem - First Aid Exam Questions With Accurate Answers. Chromatin structure - answerDNA exists in condensed chromatin form in order to fit in nucleus Negatively charged DNA loops twice around positively charged histone octamer (2 sets of H2A, H2B, H3 and H4) to form nucleosome "bead" Octomer subunits consist primarily of lysine and arginine amino acids (positively charged). H1 ties nucleosome beads together in a string Heterochromatin - answerCondensed, transciptionally inactiv...

USABO QUESTIONS CORRECTLY ANSWERED 2024. 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, including animals, plants and funghi. Euchromatin - ANSWER This shows as pale areas in the nucleas under electro magnification. It is a less ...

Heterochromatin - Regions in chromosome where fibers are highly condensed Few genes - resistant to transcription by not completely exempt Concentrated in centromeres and telomeres What is a simple genome and which type of cell has one? - Codes for fewer proteins then a complex genome, prokaryotes Plant cell walls were.... - Reacquired after eukaryotes lost cell walls when they diverged from prokaryotes Genes - Regions of DNA transcribed into any type of RNA What are RNPs? Examples - Ribo...

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 ...

Heterochromatin correct answers form of DNA - tightly coiled, usually peripherally placed in the nucleus, dark-staining, inactive - not involved in RNA synthesis Euchromatin correct answers form of DNA - partially/fully uncoiled, centrally placed, light staining, active - involved in RNA synthesis Basophilic correct answers stains readily with basic dyes (e.g haemotoxylin is a basic dye that stains the nucleus - which is basophilic - blue/purple) Nuclear envelope correct answers double-...