cell wall and cell membrane
Nuclear Pores
Prions are too poorly understood to give a definitive answer on this. However it is believed that the normal version of the protein (PrPC) resides on the cell membrane and is involved in cell to cell communication. So it's likely that the prions don't enter the cytoplasm.
Through proteins in the membrane.
No
Pollutant
Nuclear Pores
The cytoplasmExplanation...Cytoplasm is a jellylike material inside the cell membrane that surrounds the nucleus of a cell and contains most of the cell's internal parts. Cell membranes serve as the outer boundary of the cells. The membranes help control the substances that enter or exit a cell. The nucleus is the "brain" or control center of the cell that stores inherited information. Animal cells do not have chloroplasts or a cell wall.--------------------------------------------------------------------------------
Cytoplasm holds all the organelles in place.
a carrier protein
penis
Xylems
Prions are too poorly understood to give a definitive answer on this. However it is believed that the normal version of the protein (PrPC) resides on the cell membrane and is involved in cell to cell communication. So it's likely that the prions don't enter the cytoplasm.
The cast of Enter Aaron Cross - 2012 includes: Dan Bradley Tony Gilroy
Yes, the lysosomes provide the material which helps break down the plasma membrane and cytoplasm of the ova, allowing the sperm to enter the egg for fertilisation.
Stomata.
A waxy barrier in the plant root.The waxy barrier in the plant root prevents molecules that are in the cell walls from entering the xylem directly. To move into the xylem, molecules must first cross a plasma membrane and enter the cytoplasm of a root cell. This allows a plant to be selective about what enters the xylem.
Through proteins in the membrane.