1. Chapter 4 By: Natalie Altieri

2.  The central and most important part of an object, movement, or group, forming the basis for its activity and growth. -It is in most eukaryotic cells.

3.  Surrounded by a nuclear envelope composed of 2 phospholipid bilayer. - It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins. -The genes within these chromosomes are the cell's nuclear genome.

4.  The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and separates its contents from the cellular cytoplasm. - The inner membrane is stabilized by a meshwork of intermediate filament proteins called laminas.

5.  The nuclear envelope is perforated by thousands of nuclear pore complexes that control the passage of molecules in and out of the nucleus. - These pores cross both of the membranes, providing a channel that allows free movement of small molecules and ions.

6. 1) It controls the heredity characteristics of an organism. 2) It is responsible for protein synthesis, cell division and growth. 3) It stores material in the form of DNA strands.

7.  Has a highly Viscous Liquid.  Enveloped by the inner membrane of the nuclear envelope.  It surrounds the chromatins and nucleolus.

8.  It is the protoplasm of the nucleus of a cell. - Also called karyoplasm.  It is mostly made of up of water, a mixture of molecules, and dissolved ions. - Its main function is to serve as a suspension substance for the organelles inside the nucleus.

9.  Is a round body located inside the nucleus of a eukaryotic cell. It is not surrounded by a membrane, but sits in the nucleus.  Generally located in the center of the nucleus. - Small, dense region

11.  Cancer ◦ -People with cancer have a nucleus that is abnormal in shape and size characterized by blebs, which is a irregular bulge.  Downs Syndrome ◦ - The nucleus of a normal human cell has about 23 chromosomes, but people with downs syndrome have an extra copy of chromosome 21.