What is a gene? Explain giving two examples.
Write about cells that do not have a definite shape and keeps changing their shape.
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- Infact, Amoeba has no definite shape, unlike other organisms. It keeps on changing its shape. ... The picture shows different cells such as blood, muscle and nerve cells of human beings. The different shapes are related to their specific functions.
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Generally, cells are round, spherical or elongated in shape. Some cells such as nerve cells are quite long and have extensive branching. Some cells such as Amoeba has no fixed shape. It keeps changing its shape. White blood cells in humans can also change its shape. The cell membrane provides shape to the cells of animals and plants.
There is a wide variation in the size of the cells also. Most of the cells cannot be seen with naked eye. The smallest cell (a bacterium) is 0.1–0.5 μm in size while the largest cell measuring 170 mm 130 mm is the egg of an ostrich. Longest cells of human body are the nerve cells, which may reach a length of 90 cm.
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