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Cell : The Unit of Life

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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Cell : The Unit of Life
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Solved Pre-Board Papers | 2018 Solved Sample Papers | Solved Previous Year Papers
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. .

 

Answer
    •  What are receptor molecules ?
    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. 
    Answer
    • Who reported that the cell had an outer layer which is known as plasma membrane today?
    Theodore Schwann 
    Answer
    • State one difference between gram positive and gram negative bacteria.
    Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not. 
    Answer
    • What is the function of contractile vacuole in amoeba?
    Excretion.
    Answer
    • Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?
    Mathias Schleiden.
    Answer
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