P.41 and P.45 #1-5

April.9, 2013
Page 41 and 45 Question Number 1-5

P.41

1.Define the term stem cell.
Ans: Stem cell is an unspecialized cell. Stem cells can form specialized cells when exposed to the proper environment and conditions.

2.Explain how stem cells can become specialized.
Ans: Stem cells can become specialized when they are exposed to the proper environmental conditions.

3.Compare and contrast embryonic stem cells and adult stem cells.
Ans: Adult stems cells are already differentiated.So"They can only become what they came from." Embryonic stem cells can develop into anything.

4.State one practical use of stem cell research.
Ans: Cloning and regenerative medicine.

5.What are meristematic cells?
Ans: Meristematic cells are plant stem cells. They are found growing on the tip of plants.

P.45

1.Define the term tissue.
Ans: A tissue is a group of cells that function together to perform specialized tasks.

2.What is the link between specialized cells and tissues?
Ans: Specialized cells with the same function from tissues.

3.Compare the structure and functions of epithelial tissue and epidermal tissue.
Ans: Epithelial tissues lines body cavities and outer surface, protect structures and from glands that produce hormones, enzymes and sweat.They are made from cells that are tightly packed together. Might be 1 cell thin or contain several layers.
Epidermal tissues are the protective barrier of plants, they form the protective outer covering and allows the exchange of materials and gases into and out of the plant.

4.What are four types of animal tissues?
Ans: Muscle tissue, epithelial tissue, nervous tissue, connective tissue.

5.What are four types of plant tissues?
Ans: Vascular tissue, ground tissue, meristematic tissue, epidermal tissue.