Questions: Which of the following is the function in eukaryotic cells? It is where all the nuclear DNA is located. It is where ribosomal RNA is synthesized and ribosome assembly begins. It is where cellular respiration takes place. It is where transcription and translation of all gene products take place.

The answer is the second one: It is where ribosomal RNA is synthesized and ribosome assembly begins.

Explanation for each option:

1. It is where all the nuclear DNA is located.
   This describes the nucleus, not a specific function within the nucleus. The nucleus houses the cell's DNA, but the question seems to be asking about a specific function related to a substructure within the nucleus.

2. It is where ribosomal RNA is synthesized and ribosome assembly begins.
   This describes the nucleolus, a substructure within the nucleus of eukaryotic cells. The nucleolus is responsible for synthesizing ribosomal RNA (rRNA) and assembling ribosome subunits, which is a critical function for protein synthesis.

3. It is where cellular respiration takes place.
   This describes the mitochondria, not a function within the nucleus. Mitochondria are the organelles where cellular respiration occurs, producing ATP for the cell.

4. It is where transcription and translation of all gene products take place.
   Transcription occurs in the nucleus, but translation occurs in the cytoplasm, specifically on ribosomes. Therefore, this statement is incorrect as it combines two processes that occur in different locations within the cell.

In summary, the correct function related to a specific part of the eukaryotic cell is the synthesis of ribosomal RNA and the beginning of ribosome assembly, which occurs in the nucleolus.