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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
Descrbe  cilia or flagella.

Cilia and flagella are hair-like outgrowths of the cell membrane. Clia are smaller structures while the flagella are longer. They are formed basal bodies which are centriole-like structures. Both help in movement of cell. The cilium and flagellum are covered with plasma membrane. They have a core called axoneme which has nine pairs of doublets of radially arranged peripheral microtubules and a pair of centrally located microtubules. This arrangemt of microtubules is calld 9+2 array. The central tubules are covered by a sheath and are connected to each other. The sheath is connected to one of the tubules of the peripheral doublet by a radial spoke. There ate nine radial spokes in total. The linkers connect the doublets to each other.

 
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 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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State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not. 
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What is the function of contractile vacuole in amoeba?

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

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

Mathias Schleiden.
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