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Structure and Function of Lysosomes and Vacuoles

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Evan McDonnell

on 10 October 2012

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Transcript of Structure and Function of Lysosomes and Vacuoles

Structure and Function of
Lysosomes and Vacuoles By: Evan, Mario and Phillip Lysosomes A vacuole is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal and bacterial cells. Vacuoles are essentially enclosed compartments which are filled with water containing inorganic and organic molecules including enzymes in solution, though in certain cases they may contain solids which have been engulfed. Vacuoles are formed by the fusion of multiple membrane vesicles and are effectively just larger forms of these. The organelle has no basic shape or size; its structure varies according to the needs of the cell. Vacuole In general, the functions of the vacuole include:

Isolating materials that might be harmful or a threat to the cell

Containing waste products

Containing water in plant cells

Maintaining an acidic internal pH

Containing small molecules

Exporting unwanted substances from the cell

Allows plants to support structures such as leaves and flowers due to the pressure of the central vacuole

In seeds, stored proteins needed for germination are kept in 'protein bodies', which are modified vacuoles. That way! Down there THE END! What is a lysosome lysosomes are cellular organelles which contain the enzyme hydrolase

Lysosomes are found in almost every animal eukaryote cell. What is their function The function for a lysosome is to break down debris and any other unwanted things within the cell (sometimes referred to as stomach of cell)

After they complete their function their normally get recycled and that is why they are known as the suicide sacs/organelle.

Along with the digestion they are also “band-aids” of the cell.

They repair damages to the plasma membrane b y acting as a sealing patch. How is it able to break down Things The lysosome can perform this function due to the hydrolytic enzymes it contains.

These hydrolytic enzymes come in the form of minute crystalline or semi-crystalline granules. Lysosomes are spherical structures bound by a single layer membrane.

The lysosome size may vary between 0.1 to 1.2μm.

Within the lysosomes are your hydrolytic enzymes and some examples are lipases, proteases, nucleases etc. Structure of a lysosome How are they created The sigestive enzymes which are needed to create the lysosme are created within the endoplasmic reticulum.

After these have been created they are sent to the Golgi apparatus where they are modified then budded off.

After being budded off a piece of a vesicle is dissected and that is the lysosome.
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