Infoldings of the mitochondrial inner membrane are called

The inner membrane forms a number of infoldings called the cristae towards the matrix.
The cisternae are found in the Golgi body that helps in the modification of proteins.
The interphase nucleus (nucleus of a cell when it is not dividing) has highly extended and elaborate nucleoprotein fibres called chromatin.
In cyanobacteria pigments are present in chromatophores.