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Developmental Biology
Developmental Biology

... All postembryonic growth occur at meristems which give rise to all adult structures (shoots, roots, stems, leaves and flowers) and have the capacity to divide repeatedly and give rise to a number of tissues (like stem cells). Two meristems are established in the embryo, one at the root tip and one ...
Human Embryology and Natural Stem Cells iPS…..induced
Human Embryology and Natural Stem Cells iPS…..induced

... Oocyte nucleus becomes Female Pronucleus, Sperm nucleus - Male Pronucleus C. Zygote Nucleus - fusion of female and female pronuclei - contains the Fetal Genome Genome = sum total of all the genetic information for any organism; >3,000,000,000 nucleotides; over 6 meters of DNA; 46 chromosomes; ~23,00 ...
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Basic Theories for Introductory Biology
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... Division of Labor & The First Level Within multi-cellular organisms there is division of labor. Division of labor means that the work (labor) of keeping the organism alive is divided (division) among the different parts of the body. Each part has a job to do and as each part does its special job, i ...
CHAPTER 2 : CELL AS THE BASIC UNIT OF LIFE
CHAPTER 2 : CELL AS THE BASIC UNIT OF LIFE

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Slide 1 - SFP Online!

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... D. When the salt concentration outside the cell is very low, diffusion causes water to move outside the cell, and the contractile vacuole does not need to contract as rapidly. ...
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Levels of Organization - Flipped Out Science with Mrs. Thomas!
Levels of Organization - Flipped Out Science with Mrs. Thomas!

... Within multi-cellular organisms there is division of labor. Division of labor means that the work (labor) of keeping the organism alive is divided (division) among the different parts of the body. Each part has a job to do and as each part does its special job, it works in harmony with all the other ...
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Chapter 3 - Pelican Rapids School

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Cell theory



In biology, cell theory is a scientific theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1838. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. Cell theory has become the foundation of biology and is the most widely accepted explanation of the function of cells.The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the most basic unit of life. All cells arise from pre-existing, living cells, by biogenesis.
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