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    Cell : The Unit of Life

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    Biology

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    Cell : The Unit of Life
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    Mitochondria and chloroplasts are semiautonomous organelles. 
    Chloroplasts and mitochondria are called semiautonomous organelles due to the following reasons :

    1. They have DNA, RNA, ribosomes and  other materials required to synthesize their own essential proteins.

    2. They manufacture their own enzymes.

    3. They can multiply and give rise to new organelles of the same kind. .

     

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    Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell. When such chemical signals bind to a receptor, they cause some form of cellular response. 
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    Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?
    Mathias Schleiden.
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    State one difference between gram positive and gram negative bacteria.
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    Theodore Schwann 
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    What is the function of contractile vacuole in amoeba?
    Excretion.
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