Biology N212

The largest object in the cell, and is where DNA, the main genetic material, is stored.

The nucleus is surrounded by two membranes that are the?

What are large openings through the envelope thatallow cytoplasmic material (like proteins) to enter and nuclear products (likeribosomes) to exit the nucleus?

Inside the nucleus are the          ,             , and enzymes to make DNA and RNA. 

What is a dark region within the nucleus; it is an area of intense ribosome synthesisand assembly?