materials enter and leave the nucleus through openings in its cell wall and membrane
By the nuclear pores that stud the double walled membrane. These check points are tasked with, for instance, checking mRNA quality as it leaves the nucleus.
The opening between the vocal cords at the upper part of the larynx is the glottis.
Cell Membrane
Yes, materials that enter the cell by phagocytosis also cross through the cell membrane, but in a different manner compared to passive or active transport. In phagocytosis, the cell membrane engulfs large particles or microorganisms, forming a vesicle that brings these materials into the cell. This process involves the membrane folding around the substance rather than allowing it to pass through like smaller molecules do in passive or active transport.
Endocytosis, particularly, phagocytosis because the amoeba surrounds the food particle and engulfs it. The food particle is then enclosed into a food vacuole inside the cell where it can be accessed when the cell needs food.
Nucleus Pores
Materials usually enter through the cell wall.
Materials enter and leave the nucleus through nuclear pore complexes in the nuclear envelope. Large molecules, such as proteins and RNA, are actively transported into and out of the nucleus through these pores using specific transport proteins. Small molecules, like ions and small proteins, can freely diffuse through the pores.
Materials can enter a cell through processes like diffusion, facilitated diffusion, and active transport. These substances can leave a cell through processes such as diffusion, osmosis, and exocytosis.
Proteins enter the nucleus through nuclear pores in the nuclear membrane. These pores allow specific proteins to pass through and enter the nucleus where they can perform their functions.
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.
Yes materials made inside of the nucleus such as ribosomes must leave
yes
By the nuclear pores that stud the double walled membrane. These check points are tasked with, for instance, checking mRNA quality as it leaves the nucleus.
The opening between the vocal cords at the upper part of the larynx is the glottis.
mRNA does not enter the nucleus. It is transcribed from DNA inside the nucleus and then exits the nucleus to carry genetic information to the ribosomes in the cytoplasm for protein synthesis.
This creates a tiny opening in the breast, through which bacteria can enter.