Heterochromatin is a tightly coiled DNA (deoxyribonucleic acid) mainly associated with the nuclear envelope. Due to the tight coiling, gene expression is inhibited in heterochromatin. However, it may function in controlling transcription, cell division, and metabolic activities.
Hence, the correct option is (c) are associated with nuclear envelope.
Euchromatin is the region of chromosome that contains highly active genes.
Hence, the option (a) is incorrect.
Most of the genes are present in heterochromatin.
Hence, the option (b) is incorrect.
Prokaryotes do not have chromatin.
Hence, the option (e) is incorrect.