You add a chemical to a cell that prevents all of the chromatin from uncoiling so that the chromosomes remain highly coiled, even after the completion of mitosis.

Which of the following is an explanation for how there can be differential gene expression throughout a multicellular organism? A) There are unique sets of genes present in the different tissues of the organisms B) Some tissues have histones, while other cells do not use histones C) There are unique combinations of transcription factors in different tissues of the organism D) Different tissues throughout the organism use different genetic coding rules .

28. When studying living cells in a laboratory, rescarchers sometimes use drugs as a way to make cells remain at a particular stage of the cell cycle A drug that inhibits cytokinesis would leave cells arrested at which phase in the cell cycle? A) Interphase B) Telophase C) Anaphase D) Prophase E) Metaphase 29. An epigenetics modification is where: A) The DNA sequence of a gene is changed, altering gene expression B) A chemical modification (ie methylation) of DNA occurs that alters gene expression C) Gene expression is permanently changed over the course of many generations D) Both A and C E) Both B and C 30. A very rare dominant allele that causes the little finger to be bent has a penetrance value of 80% This means that? A) 80% of the total population does not have a bent little figure B) 80% of all heterozygotes carrying the allele will have a bent little finger C) 80% of the total population carries the allede for bent little finger D) 80% of all homozygous individuals carrying the…

You are working in a lab studying Progeria. You design an expression vector containing a mutated form of the lamin gene that codes for a lamin protein that can no longer be phosphorylated. What do you predict would happen if you express this mutant form of lamin in a cell line? Lamin proteins would not be transported into the nucleus and would remain in the cytosol. Nuclear lamins will be unable to produce dimers, as the coiled-coil formation will be disrupted. Disassembly of the nuclear lamins will occur prematurely. Nuclear lamins will no longer disassemble properly during prometaphase. O Nuclear lamins will no longer assemble properly during telophase.