1. The structure of nuclear membrane is suitable for a) organization of spindle for nuclear division
b) nucleocytoplasmic exchange of materials
c) separation of chromosomes
d) synthesis of ER

OPTION B IS THE CORRECT ANSWERExplanation:Nucleocytoplasmic exchange of materialsIn eukaryotic cells, the nucleus is bound by a double membrane or nuclear envelope. It possesses openings at certain intervals called as 'nuclear pore'. Nuclear pores are large protein complexes regulates the exchange of material between nucleus and cytoplasm, i.e., nucleo-cytoplasmic exchange of materials. 

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Single strand binding protein by peptide bond