INTRODUCTION
CELL STRUCTURE
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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: -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-2: -The main function of the phospholipid bilayer is to allow the cell to be selectively permeable, meaning it only lets certain things in and out. The phospholipid bilayer prevents large molecules or charged molecules like ions from diffusing directly across the membrane without the use of a channel protein.
Detailed explanation-3: -An important property of lipid bilayers is that they behave as two-dimensional fluids in which individual molecules (both lipids and proteins) are free to rotate and move in lateral directions (Figure 2.46). Such fluidity is a critical property of membranes and is determined by both temperature and lipid composition.