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Question:

Which one of the following statements is correct?

The gene for producing insulin is present in all human cells

DNA consists of a core of eight histones

Centromere is found in animal cells, which produces aster during cell division

Nucleosome is formed only of the nucleotides

Solution:

  1. DNA is made up of nucleotides. Each nucleotide consists of a nitrogen base, five-carbon sugar, and phosphate molecule.
  2. The centromere is the region of the chromosome where two sister chromatids linked. It is found in all animal cells and plants. It is the region where microtubules are attached to the kinetochore.
  3. The gene for producing insulin is present in everybody's cell. But these genes are expressed in particular cells (Beta cells of the pancreas). The genes are inactive or turned off in other cells.
  4. The nucleosome is made up of the segment of DNA, histone protein core (histone octamer). Histone octamer is linked to DNA by H1 histone.
    Thus, the correct answer is option C.