9. Nucleosomes are a. Ribosome-mRNA complexes b. Condensed chromosomes c. Barr b
ID: 206033 • Letter: 9
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9. Nucleosomes are a. Ribosome-mRNA complexes b. Condensed chromosomes c. Barr bodies d. Another term for centrioles e. DNA-histone complexes 10. Chromosome-level gene repression involves a. Supercoiling b. Physical blockage of gene regions c. Chromatin formation d. Nucleosomes e. All of the above a. Induction b. Gene regulation c. Chromatin remodeling d. Nucleosome formation e. None of the above 12. Heterochromatin is associated with a. Differential gene expression b. Gene silencing c. mRNA translation d. heterozygotes e. A., B, and CExplanation / Answer
9. Nucleosomes are basic DNA packaging units in eukaryotes that consists of a DNA segment wound around eight histone proteins. These histone proteins form the cores of the nucleosome. So, the correct option is option E, DNA histone complexes.
10. For gene repression to occur at the chromosome level several mechanisms of gene repression can occur such as DNA supercoiling, physical blockage of gene regions, chromatin formation, and nucleosomes formation. So, the correct option is option E, all of the above.
11. Chromatin remodeling is the process of remodeling of the architecture of the chromatin so that the condensed DNA becomes accessible to the transcription regulatory machinery. So, the correct option is option C, chromatin remodeling.
12. Heterochromatin is a condensed form of DNA. Since the DNA is condensed it becomes inaccessible for the transcription machinery thus resulting in the silencing of gene expression. Thus heterochromatin is associated with gene silencing. So, the correct option is option B, gene silencing.
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