Identify the incorrect pair.

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(D) $1$. The egg of an ostrich is the largest isolated single cell.$2$. Mycoplasma are the smallest living cells,measuring about $0.3 \mu m$ in length

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Mantle - present on cytoplasmic region

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(D) $1$. The egg of an ostrich is the largest isolated single cell.$2$. Mycoplasma are the smallest living cells,measuring about $0.3 \mu m$ in length.$3$. $A$ Kinetochore is a protein structure on chromatids where spindle fibers attach during cell division; it is not an organelle,and the term 'organelle without membrane' usually refers to structures like ribosomes or centrioles.$4$. The 'Mantle' is not a standard term for a structure present in the cytoplasmic region of a cell in the context of cell biology. Therefore,option $D$ is the incorrect pair.

Cell Organelle	Function
$(A)$ Endoplasmic Reticulum	$(i)$ Powerhouse of the cell
$(B)$ Free Ribosomes	$(ii)$ Involved in osmoregulation and excretion
$(C)$ Mitochondria	$(iii)$ Lipid synthesis
$(D)$ Contractile Vacuole	$(iv)$ Protein synthesis

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