Name the cell organelles which have hydrolysing enzymes.

Lysosomes.
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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 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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George plade discovered the organelle?

Ribosomes

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What are informational molecules ?

Informational molecules are macro-molecules having specific sequence of constitutent subunits e.g. proteins and nucleic acids. The Information molecules store genetic information. 
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