Cell membrane pores are made up of protein.
protein
They selectively allow certain size molecules to enter, or not to enter, the cell.
Aquaporins are protein molecules embedded in the phospholipid bilayer (cell membrane ) of some cells. They transport water across the cell membrane.
The primary structural component of a cell membrane is the phospholid layers. This is mainly made of proteins which facilitate various cell activities.
Membrane Membrane
The cell has a lipid bilayer with embedded proteins that gives it shape. The cell membrane is rather fluid but also slightly rigid. This allows the cell to change shape but it cannot change shape very much. The membrane can seal itself if pierced by something very thin like a pin.The cell membrane holds it together as it's made of phospholipids.
Openings in the nuclear membrane are called "pores"
Cell wall
yes
"Nuclear pores are large protein complexes that cross the nuclear envelope, which is the double membrane surrounding the eukaryotic cell nucleus."
no
Cell membrane
The cell membrane is the border allowing entry and exit of materials through the cell. Both animal and plant cells have one.
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.
the protein form the
Sort of, but some are gated.
Receptors, Selective Channels and pores
I believe it is the Cell Membrane.