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CELL THEORY The cell theory describes the structural organisaCon of all living things. According to the cell theory: • The cell is the smallest unit of life (unicellular organisms are capable of all seven funcCons of life) • All living things are composed of cells (or their cellular products – such as hair, nails, etc.)
The study of cells is called cytology and is based on the cell theory, which proposes that nucleated cells are the basic structure of plants and animals. This concept was observed and published separately, first by the botanist, Matthias Schleiden, in 1838, and then by the zoologist, Theodor Schwann, in 1839. Their work demonstrated that cells ...
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UNIT 3. UNIT3. Biology is the study of living organisms. The detailed description of their form and appearance only brought out their diversity. It is the cell theory that emphasised the unity underlying this diversity of forms, i.e., the cellular organisation of all life forms. A description of cell structure and cell growth by division is ...
Today, the cell theory,which states that all organ-isms are made up of basic living units called cells and that cells come only from preexisting cells, is a basic theory of biology. The cell theory states the following: All organisms are composed of one or more cells. Cells are the basic living unit of structure and function in organisms.
- 1.1 Motivation
- How do cells maintain their shape?
- How do cells move?
- How do cells transport material?
- How do cells interact with their environment?
- 1.3 Introduction to biopolymers
- 1.5 Introduction to biomembranes
Why is the understanding of cell mechancis important? cells need to move and interact with their environment cells have components that are highly dependent on mechanics, e.g., structural proteins cells need to reproduce / divide to improve the control/function of cells to improve cell growth/cell production medical appli-cations mechanical signals...
What are the mechanical properties of the individual components that give the cell it’s strength and elasticity? What are their stability limits?
What are the structural components that support cellular motion? How is motion gen-erated according to Newton’s laws which teaches us that cells need to adhere to push themselves forward?
What are the mechanisms by which proteins are transported from their production site to their working site?
What are the cell’s mechanisms to sense environmental changes and respond to them?
A typical finding is that other than most engineering materials like steel or concrete, cells are extremely soft, almost liquid like. Their mechanical behavior and their mi-crostructure resemble those of rubber. Rubber consists of a network of polymeric chains that become more resistant to deformation when heated. This is somewhat counterintuitive ...
All cellular components are contained within a cell membrane the mechanical proper-ties of which we will explore throughout this class. The cell membrane is extremely thin, approximately 4-5nm, and flexible, which allows the cell to easily adjust its shape in response to environmental changes. Just think of red blood cells which have to be squeezed...
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Modern Cell Theory. Modern Cell Theory consists of the 3 basic components of cell theory, plus 4 additional statements: 4. The cell pass information from cell to cell during cell division using DNA. 5. All cells have basically the same chemical composition and metabolic activities. 6.
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1. Every living organism has at least one cell. 2. The cell is the smallest unit of life. 3. Only living cells can give rise to new cells. mitosis or meiosis. 1. Every organism is made of cell(s) • Eukaryotic cells contain: a membrane bound nucleus. DNA that is contained within the nucleus. membrane bound organelles.
