H2b - Study guides, Class notes & Summaries

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...

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 four criteria must genetic material meet in order to metabolize nutrients in food? Information Replication Transmission Variation What is a discrete unit of genetic material composed of DNA and associated proteins? Chromosomes Eukaryotes have chromosomes in there? nuclei, plastids, and mitochondria What macromolecules is composed of nucleotides? nucleic acids Nucleotides are composed of? a phosphate group, a five-carbon sugar, and a nitrogen-containing base What two nucleic acids are r...

Bio 181 (Module 4: Self Check)The actin filament system extends outside of the cell. - correct answer False Consider the geography of cells. Actin filaments are present in the cell's ___ and the microtubules are present in the cell's . - correct answer cell cortex - cell interior Chromosomes are made out of Euchromatin. - correct answer True To get into the nucleus a component has to have the correct signal sequence and pass through a nuclear pore. - correct answer True The actin f...

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...

Describe the structure of a prokaryotic (bacterial) genome correct answer: 1. Circular in bacterial cells, 2. attached to the plasma membrane, 3. Can include a separate DNA fragment (plasmid DNA) What shape are plasmids? correct answer: Also circular What are 2 properties of plasmids? correct answer: 1. Can carry antiobiotic resistance, 2. Can be transferred between bacteria How many DNA molecules are in a human chromosome/genome? correct answer: 1 single DNA molecule What is chr...

FRNSC 420 - EXAM 2 PRACTICE QUESTIONS AND ANSWERS (100% PASS) nucleosome assembly/reassembly after replication - Answer️️ -- old H3-H4 tetramers remain bound to one of two daughter duplexes at random - old H2A-H2B dimers dissociate and compete to associate with tetramers - DNA sliding clamps mark replicating DNA and recruit chromosome assembly factors (CAFs) as chaperones - CAFs free nucleosomes and escort to newly synthesized DNA; NAP-1 escorts new/old H2A-H2B dimers, CAF-1 escorts ...

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...

What is a nucleosome made of? Eight histone proteins and two rounds of DNA double helix wrapping around those eight histone proteins What are the names of the histone proteins? H2a, H2b, H3, and H4 (two of each) What cells have a nucleosome? Eukaryotic cells What phase is interphase in? mitotic phase In what phase does DNA replication take place? the S phase on interphase Interphase takes up what percent of the cell cycle? the longest time When does the centrosome replicate (duplicate)? en...

SI Practice Exam 4 |57 Questions with Verified Answers Which of the following statements is FALSE of the spliceosome and splicing mechanism? a. U1 snRNA base pairs with the 5' splice site b. The active spliceosome is produced when U1 and U3 snRNP exit c. U2 snRNA and U6 snRNA base pair to each other for the 1st reaction to occur d. U2 snRNA anneals to the branch site in the intron - CORRECT ANSWER b. The active spliceosome is produced when U1 and U3 snRNP exit Where are SR protein...