Discuss cell surface transport in the structure of constituents

Cell surface or membrane is made of phospholipid bilayer with embedded proteins and sugars. Cell membrane acts as a barrier between cell and its external environment but it is also responsible for the communication with other cells and transport of molecules inside and outside the cell. It is selectively permeable to ions and molecules (some of them pass through the membrane easily, while others require transport proteins or channels). There are 4 ways of molecule transport:

1.Diffusion – no energy required

2.Facilitated transport – transport proteins included

3.Active and co-transport – energy required

4.Vesicle transport (exocytosis and endocytosis)

Microvilli are extensions of cell membrane that increase its surface for diffusion.

Different types of cell junctions have a different influence on the membrane transport. For example, tight junctions are a barrier and the molecules are unable to pass through.

due to the fact that it skipped a generation we can tell it is definitely not a dominant trait, therefore it must be recessive. i think this is right let me know!

explanation:

answer by yourhope:

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human impact on the environment can be seen in the deterioration of the !

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