What is the structure that holds together the two sister chromatids that form a chromosome?

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

Which example would the nurse consider to be a part of systems thinking theory?

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has