24: Epigenetic Mechanisms Quizellenj2022-11-23T14:13:22-05:00 Please sign up for the course before taking this quiz. 1. How many histones come together to make the nucleosome?1 4 8 12 2 2. The “switches” on nucleosomes (histone spools) can be activated by all of these molecules EXCEPT:1 Methyl (CH3) Phosphate (PO4) Acetyl (COCH3) DNA polymerase 3. Genes can be made up of many different DNA sections that are spread out and must be spliced together.1 True False 4. When a gene is being used and being transcribed, we say it is being _______________.1 expressed modified exposed silenced 5. 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 6. What do nucleosomes/histones help to do?1 Translate proteins. Keep DNA organized. Replicate DNA. "Spell check" replicated DNA for errors. 7. What does methylation do to DNA?1 Keeps the DNA strands closed so they cannot be transcribed. Replicates it. Destroys "junk" DNA. Opens DNA strands to promote DNA transcription. 8. What does “epi-genetics” roughly mean?1 "before genes" "without/no genes" "outside of the genes" "within the genes" 9. What is the “methyl” group?1 CH4 CH3 CH3-R COOH 10. MicroRNAs or miRNAs help to regulate gene expression by1 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. 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. 23: Mitosis (and DNA replication) Final Exam: lessons 1-24 Back to: 24: Epigenetic Mechanisms
