GPS -SB1: Cells- Students will analyze the structure and functions of cells.
Objectives:
EQ: How do the cells in living organisms control or affect homeostasis (the internal environment)?
· Key question – How can I identify the parts of the cell?
· Key question – How does each cell function “what role do they play in maintaining homeostasis?”
EQ2: How does cancer cause cells to die?
· Key question -What factors control cell growth?
· Key question- What kinds of factors may lead to a cell becoming cancerous?
Introduction to Cells
Welcome to the fascinating study of cells. Cytology and Histo-cytology - are the study of cells.
Cyt- means cell Hist - means past patterns
Background:
Scientist use histo-cytology or histology to study the patterns and conditions that affect the growth of cells such as:
- *cell structure
- *homeostasis
- *virus, bacteria and fungus attacks (pathogens) path- means process to a disease
- *genetics
- *evolution
Instruction: Today you are going to become cell biologists and study the parts of the cell and the functions that each “organelle” (small helper) in the cell.
Cell theory proposed Schwann heard Schleiden as they described plant cells with nuclei, Schwann was struck by the similarity of these plant cells to cells he had observed in animal tissues. Schwann was mostly right.
· 1) The cell is the unit of structure, physiology, and organization in living things. (right)
· 2) The cell retains a dual existence as a distinct entity and a building block in the construction of organisms (right)
· 3) Cells form by free-cell formation, similar to the formation of crystals (spontaneous generation). (wrong)
Rudolph Virchow's powerful dictum, "Omnis cellula e cellula"... "All cells only arise from pre-existing cells".
Today’s Cell theory states:
1. all known living things are made up of cells.
2. the cell is structural & functional unit of all living things.
3. all cells come from pre-existing cells by division.
(Spontaneous Generation does not occur).
4. cells contains hereditary information which is passed from
cell to cell during cell division.
5. All cells are basically the same in chemical composition.
6. all energy flow (metabolism & biochemistry) of life occurs
within cells. [GPS- SB1 & SB2}]
Download your study guide:
1) Cruise around here and see what the “cell theory is all about”
http://www.bio.miami.edu/~cmallery/150/unity/cell.text.htm
2) Go to www.cellsalive.com to investigate our next unit. You will complete the chart and the essential questions for this website.