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Cell : The Unit of Life

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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. .

Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?

Mathias Schleiden.

What is the function of contractile vacuole in amoeba?

Excretion.

Who reported that the cell had an outer layer which is known as plasma membrane today?

Theodore Schwann

State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not.

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.

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