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Packaging of DNA and gene expression
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Which one of the following statements about the particular entity is true?Every somatic cell of the body arises from the zygote by mitosis, so every body cell has the complete set of genes, including the gene for insulin. The gene is expressed, however, only in the β-cells of the pancreas. This statement is true.
The centromere is the primary constriction of a chromosome that holds the two chromatids together; the structure that forms the aster in animal cells is the centriole (centrosome).
A nucleosome is made of DNA (about 200 bp) wrapped around a histone octamer, not simply of nucleotides.
The core of eight histones is part of the nucleosome; DNA itself is a polymer of deoxyribonucleotides.
Hence the true statement is that the gene for producing insulin is present in every body cell.