Nucleus
Cell wall
the membrane that surrounds the nucleus is the nuclear envelope. It has two layers, an inner and outter layer; each layer is made up of a phospolipid bilayer. There are small holes in the nucleur envelope called pores.
plastids
Phospholipid :)
The covering of the nucleus is called the nuclear membrane. The nuclear membrane contains pores called nuclear pores. These pores allow ribosomes made in the nucleolus (which floats inside the nucleus) to be sent out onto the cytoplasm or to attach to the endoplasmic reticulum.
nuclear envelope
The nuclear envelope is a double-layered membrane that surrounds the nucleus. The nuclear envelope has nuclear pores that regulate materials going in and out of the nucleus.
nuclear membrane
The nuclear membrane consists of a double membrane that enclose the nucleus. These membranes are made of phospholipids with numerous pores.
Nucleus is enclosed in double walled nuclear membrane. Nuclear membrane at certain distance have pores in them which are called nuclear pores. Nuclear pores are very selectively permeable.
Nuclear Envelope is a double membrane covering which separates the nucleus from the cytoplasm. It is a discontinuous covering which us perforated by several nuclear pores. Nuclear pores allow exchange of materials between the nucleus and cytoplasm. The outer membrane of nucleus is usually connected with endoplasmic reticulum. It bears ribosomes.
"Nuclear pores are large protein complexes that cross the nuclear envelope, which is the double membrane surrounding the eukaryotic cell nucleus."