Oxidative phosphorylation is the step of cellular respiration that  produces the most ATP. The process that uses energy stored in a  hydrogen ion gradient across a membrane â¦ to drive ATP synthase is  chemiosmosis.
In eukaryotic cell, DNA is found at the nucleus, which is bounded by a double membrane. (the word eukaryotic is from the Greek eu, true, and karyon, kernel, here referring to the nucleus). Eukaryotic cells are much larger than prokaryotic cells; size is general aspect of cell structure that relates to function.
  Most of the DNA in a eukaryotic cell is in the nucleus, and that is where DNA replication and transcription occur.In eukaryotic cells, mitochondria and chloroplasts a â¦ lso contain DNA, which performs replication and transcription inside these organelles. In prokaryotic cells there is no nucleus.The DNA is in a region of the cytoplasm called the nucleoid, and that is where DNA replication and transcription occur in these cells.n prokaryotic cells there is no nucleus. The DNA is in a region of the cytoplasm called the nucleoid, and that is where DNA replication and transcription occur in these cells.