Final answer:
The presence and function of factor Z is found in the kidney. Factor Z is a protein that is normally present and bound to DNA in the cell nucleus.
The correct answer is (a) kidney.
Step-by-step explanation:
Factor Z is a protein that is normally present and bound to DNA in the nucleus of cells. It is a transcription factor, meaning that it helps to regulate the expression of genes by binding to specific DNA sequences.
Factor Z is primarily found in the kidneys, where it plays a crucial role in regulating the expression of genes involved in the development and function of the kidneys. It is also found in other tissues, such as the liver and the pancreas, but at much lower levels.
The correct answer is (a) kidney.