what is chemical composition of tonoplast? and why it is
considered as non-membrane bounded organelle?

Answer Posted / anitha

The tonoplast is composed of proteins, including
glycoproteins and enzymes, amd lipids including
glycolipids. However, the relative amount of constituents
appears to vary considerably. Tonoplast is considered as
non-membrane bounded organelle since they are not
surrounded by plasma membrane or double membrane

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