Differentiation of cells is not easily reversible because it involves
a) changes in the nucleotide sequence of genes within the genome.
b) changes in chromatin structure that make certain regions of the genome more accessible.
c) chemical modifications of histones and dna methylation.
d) frameshift mutations and inversions.
e) excision of some coding sequences.

One group of reptiles, characterized by the fossil ark metal x

Which of the following matches the organisms described with the correct domain? a. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycanb. archaea--multicellular, eukaryotic organisms that do not have cell wallsc. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sourcesd. bacteria--unicellular, eukaryotic organisms that always lack cell walls

Astudent analyzed ears of corn that demonstrated two traits in the f2 kernels, purple or white colors and smooth on wrinkled shapes. a tabulation of 135 individual kernels gave the following results: purple and smooth = 75 white and smooth = 28 purple and wrinkled = 24 white and wrinkled = 8 what would be the only phenotype present in the f1 ger