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Chapter 3: Problem 1

Explain the three tenets of the cell theory. (page 44 )

Short Answer

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The three tenets of the cell theory are: 1) All living organisms are composed of cells, indicating that cells are the building blocks of life. 2) The cell is the basic unit of structure and function in living organisms, emphasizing the importance of cellular organization for the existence and functioning of life. 3) Cells arise only from pre-existing cells by cell division, which explains reproduction, growth, development, and tissue maintenance in multicellular organisms.

Step by step solution

01

Tenet 1: All living organisms are composed of cells

The first tenet of the cell theory states that all living organisms are made up of cells. This means that whether it is a single-celled organism like bacteria or a multicellular organism like humans, all life forms consist of at least one cell. This tenet is significant because it highlights the fundamental role that cells play in living organisms – they are the basic building blocks of life.
02

Tenet 2: The cell is the basic unit of structure and function in living organisms

The second tenet of the cell theory emphasizes that cells are both the structural and functional units of living organisms. In other words, cells not only form the physical structure of organisms but also carry out the various processes required for the organism to live and function. For instance, within a cell, there are different organelles like the nucleus, mitochondria, and chloroplasts, each performing specific functions to maintain the overall well-being of the organism. This tenet underscores the importance of cellular organization in allowing life to exist and thrive.
03

Tenet 3: Cells arise only from pre-existing cells by cell division

Lastly, the third tenet of the cell theory states that new cells are formed only through the division of pre-existing cells. This means that cells do not spontaneously generate, but rather, they are produced through a process called cell division. In cell division, a single cell splits into two daughter cells that inherit the genetic information and cellular components of the parent cell. This tenet contributes to our understanding of reproduction, growth, and development, as well as the maintenance and repair of tissues in multicellular organisms.

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