2 Written Questions

1. lies near nucleus, consists of flattened sacs of membranes stacked next to each other and surrounded by vesicles.
   
   -modify, store, and package substances produced in the tough endoplasmic reticulum. The golgi apparatus also secretes these substances to other parts of the cell and to the cell surface for export to other cells.
2. region inside the nucleus of a cell that is not dividing. Components of ribosomes are synthesized here. Nucleoli are not membrane bound structure but are tangles of chromatin and unfinished bits of ribosomes. 1 or 2 nucleoli are visible in a nondividing cell.

2 Multiple Choice Questions

1. site of protein synthesis. Ribosomes are particles of ribosomal RNA and protein. They are suspended freely in the cytoplasm or bound to endoplasmic reticulum.
   
   A single cell, such as a human liver cell that produces large amounts of protein contains millions of ribosomes.
   1. Ribosome
   2. Nucleus
   3. Nucleolus
   4. Lysosome
2. contains chromosomes made of DNA that is wrapped with special proteins called histones into a chromatin network. Chromosomes contain genes - bits of DNA that code for polypeptides. The nucleus is surrounded by a selectively permeable double membrane or envelope that contains pores and allows for the transport of large molecules such as RNA out of the nucleus and into the cytoplasm.
   1. Ribosome
   2. Nucleolus
   3. Nucleus
   4. Lysosome

2 True/False Questions

1. Lysosome → sac of hydrolytic (digestive) enzymes

   True        False

2. endoplasmic reticulum → (ER) abrv.
   
   system of membrane channels that traverse the cytoplasm. There are 2 varieties:
   
   1. Rough ER
   -studded with ribosomes, therefore site of protein synthesis
   -transport through the cytoplasm
   
   2. Smooth ER
   -synthesizes steroid hormones and other lipids
   -connects rough ER to the golgi apparatus
   -detoxifies the cell
   -carbohydrate (glycogen) metabolism

   True        False