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Revision Sheet Quarter 1 2014-2015 Department:
Revision Sheet Quarter 1 2014-2015 Department:

... 1- Prokaryotes and Eukaryotes The cells of both prokaryotes and eukaryotes contain DNA,a cell membrane, cytoplasm and organelles. Eukaryotes; DNA is found in the nucleus, while prokaryotes; DNA is found in the cytoplasm. 2- Role of phospholipid molecule in cell membrane Phospholipid molecules form t ...
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... 25. Neuron (Nerve Cell)- many entry points for signal, one path out, and transmits signal 26. Sensory Neuron (Afferent), Interneuron (Associative),and Motor Neuron (Efferent) 27. Transmission of Signal (Think Dominoes)  Start the signal (Tipping first domino)  Propagate the signal (dominoes do not ...
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... Distinguish between monocotyledons and dicotyledons in terms of root, stem structure and leaf venation. Transport of carbohydrates (in the form of sucrose) is in phloem via translocation. This process is active Phloem structure (sieve tube cell and companion cells) and process of translocation from ...
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... 29. Nucleic acids (DNA and RNA) control cell activities by directing protein synthesis. 30. Some protein are structural (hair, nails). Others function in transport (hemoglobin), movement (muscle fibers and cytoskeleton elements), defense (antibiotics), and regulation of cell functions (hormones and ...
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... Cleavage the first series of cell divisions by mitosis after fertilization Cell division is rapid, new cells do not take time for the growth phase G1 cell growth does not occur so cells decrease in size with each cleavage division ...
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... 2. The process by which mature body cells divide into new cells is called? 3. Meiosis is the cell division needed to create __________________________. 4. In human body cells, there are _______________ number of total chromosomes. Another word for a cell having the total number of chromosomes is ___ ...
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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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