THE CELL
STRUCTURE AND FUNCTION OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Proteins attach the cell membrane to the cell wall.
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Proteins prevent the cell membrane from breaking apart in water.
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Proteins allow certain substances to pass through the cell membrane.
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Proteins prevent gases, including oxygen and carbon dioxide, from passing through the cell membrane.
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Detailed explanation-1: -Although the basic structure of biological membranes is provided by the lipid bilayer, membrane proteins perform most of the specific functions of membranes. It is the proteins, therefore, that give each type of membrane in the cell its characteristic functional properties.
Detailed explanation-2: -Proteins embedded within the phospholipid bilayer carry out the specific functions of the plasma membrane, including selective transport of molecules and cell-cell recognition.
Detailed explanation-3: -Phospholipid bilayers are critical components of cell membranes. The lipid bilayer acts as a barrier to the passage of molecules and ions into and out of the cell. However, an important function of the cell membrane is to allow selective passage of certain substances into and out of cells.
Detailed explanation-4: -Membrane Proteins Integral proteins contain large hydrophobic regions, so they are held in the bilayer by hydrophobic interaction with the lipids.
Detailed explanation-5: -Biological membranes consist of a continuous double layer of lipid molecules in which membrane proteins are embedded. This lipid bilayer is fluid, with individual lipid molecules able to diffuse rapidly within their own monolayer.