Question

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Explain why is it important for cells to have a variety of ways to transport materials across the cell membrane. Be specific.​

Answer 1

Your answer is........... read correctly your answer......... The cell membrane is selectively permeable. It lets some substances pass through rapidly and some substances pass through more slowly, but prevents other substances passing through it at all.

Some small molecules such as water, oxygen and carbon dioxide can pass directly through the phospholipids in the cell membrane. Larger molecules such as glucose require a specific transport protein to facilitate their movement across the cell membrane.

Answer 2

It is important for cells to have a variety of ways to transport materials across the cell membrane to remove waste and enter nutrients.

The lipid bilayer of the membrane acts as a barrier that separates two aqueous media, the environment where the cell lives and the internal cell environment.

Cells require nutrients from the outside and must eliminate waste substances from metabolism and keep their internal environment stable.

The membrane has a selective permeability, since it allows the passage of small molecules, provided they are lipophilic, but regulates the passage of non-lipophilic molecules.

Its properties ensure that essential substances, such as glucose, amino acids, and lipids enter the cell easily, that metabolic intermediates remain in the cell, and that waste products, such as urea, leave the cell.

Thus, most of the water-soluble ions and molecules are unable to spontaneously cross this barrier, and require the presence of special carrier proteins or protein channels.

In this way, through the different types of transport, the cell maintains concentrations of ions and small molecules different from those prevailing in the external environment.

Therefore, we can conclude that it is important for cells to have a variety of ways to transport materials across the cell membrane to remove waste and enter nutrients.

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