24: Epigenetic Mechanisms Quizellenjmchenry2020-04-03T12:37:39-04:00 Please sign up for the course before taking this quiz. What is the “methyl” group?1 COOH CH3 CH4 CH3-R What does methylation do to DNA?1 Destroys "junk" DNA. Keeps the DNA strands closed so they cannot be transcribed. Opens DNA strands to promote DNA transcription. Replicates it. Genes can be made up of many different DNA sections that are spread out and must be spliced together.1 True False When a gene is being used and being transcribed, we say it is being _______________.1 exposed modified expressed silenced The “switches” on nucleosomes (histone spools) can be activated by all of these molecules EXCEPT:1 Phosphate (PO4) DNA polymerase Methyl (CH3) Acetyl (COCH3) The DNA in the nucleus contains every bit of information that any cell will ever need for the entire lifetime of the organism.1 True False MicroRNAs or miRNAs help to regulate gene expression by1 helping DNA polymerase to bind to DNA for gene transcription, therefore "upregulating" the gene. binding to DNA polymerase and preventing it from binding to DNA strands, therefore "silencing" the gene. binding to mRNA that shouldn't be translated by a ribosome, therefore blocking the product of the gene. "cutting" up pieces of mRNA into little fragments so that they cannot be translated. What does “epi-genetics” roughly mean?1 "before genes" "outside of the genes" "without/no genes" "within the genes" What do nucleosomes/histones help to do?1 Keep DNA organized. "Spell check" replicated DNA for errors. Replicate DNA. Translate proteins. How many histones come together to make the nucleosome?1 12 2 4 8 23: Mitosis (and DNA replication) Final Exam: lessons 1-24 Back to: 24: Epigenetic Mechanisms
Please sign up for the course before taking this quiz. What is the “methyl” group?1 COOH CH3 CH4 CH3-R What does methylation do to DNA?1 Destroys "junk" DNA. Keeps the DNA strands closed so they cannot be transcribed. Opens DNA strands to promote DNA transcription. Replicates it. Genes can be made up of many different DNA sections that are spread out and must be spliced together.1 True False When a gene is being used and being transcribed, we say it is being _______________.1 exposed modified expressed silenced The “switches” on nucleosomes (histone spools) can be activated by all of these molecules EXCEPT:1 Phosphate (PO4) DNA polymerase Methyl (CH3) Acetyl (COCH3) The DNA in the nucleus contains every bit of information that any cell will ever need for the entire lifetime of the organism.1 True False MicroRNAs or miRNAs help to regulate gene expression by1 helping DNA polymerase to bind to DNA for gene transcription, therefore "upregulating" the gene. binding to DNA polymerase and preventing it from binding to DNA strands, therefore "silencing" the gene. binding to mRNA that shouldn't be translated by a ribosome, therefore blocking the product of the gene. "cutting" up pieces of mRNA into little fragments so that they cannot be translated. What does “epi-genetics” roughly mean?1 "before genes" "outside of the genes" "without/no genes" "within the genes" What do nucleosomes/histones help to do?1 Keep DNA organized. "Spell check" replicated DNA for errors. Replicate DNA. Translate proteins. How many histones come together to make the nucleosome?1 12 2 4 8
