पादप कोशिकाएं मुख्य रूप से किस संरचना की उपस्थिति के कारण जंतु कोशिकाओं से भिन्न होती हैं?

Prokaryotic cells do not possess which of the following membrane-bound organelles?

The dense circular structure near the center of a eukaryotic cell is known as the:

Who among the following discovered the nucleus in cell?